diff --git a/packages/DeadCode/src/Rector/Property/RemoveUnusedPrivatePropertyRector.php b/packages/DeadCode/src/Rector/Property/RemoveUnusedPrivatePropertyRector.php
index 22076c9036f..6229134f03d 100644
--- a/packages/DeadCode/src/Rector/Property/RemoveUnusedPrivatePropertyRector.php
+++ b/packages/DeadCode/src/Rector/Property/RemoveUnusedPrivatePropertyRector.php
@@ -6,7 +6,7 @@ use PhpParser\Node;
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Expr\PropertyFetch;
 use PhpParser\Node\Stmt\Class_;
-use PhpParser\Node\Stmt\ClassLike;
+use PhpParser\Node\Stmt\Interface_;
 use PhpParser\Node\Stmt\Property;
 use PhpParser\Node\Stmt\Trait_;
 use Rector\NodeTypeResolver\Node\AttributeKey;
@@ -64,13 +64,13 @@ CODE_SAMPLE
             return null;
         }
 
-        /** @var ClassLike|null $classNode */
+        /** @var Class_|Interface_|Trait_|null $classNode */
         $classNode = $node->getAttribute(AttributeKey::CLASS_NODE);
-        if ($classNode === null || $classNode instanceof Trait_) {
+        if ($classNode === null || $classNode instanceof Trait_ || $classNode instanceof Interface_) {
             return null;
         }
 
-        if ($classNode instanceof Class_ && $classNode->isAnonymous()) {
+        if ($classNode->isAnonymous()) {
             return null;
         }
 
@@ -86,7 +86,6 @@ CODE_SAMPLE
         }
 
         $uselessAssigns = $this->resolveUselessAssignNode($propertyFetches);
-
         if (count($uselessAssigns) > 0) {
             $this->removeNode($node);
             foreach ($uselessAssigns as $uselessAssign) {
@@ -98,6 +97,9 @@ CODE_SAMPLE
     }
 
     /**
+     * Matches all-only: "$this->property = x"
+     * If these is ANY OTHER use of property, e.g. process($this->property), it returns []
+     *
      * @param PropertyFetch[] $propertyFetches
      * @return Assign[]
      */
@@ -107,9 +109,11 @@ CODE_SAMPLE
 
         foreach ($propertyFetches as $propertyFetch) {
             $propertyFetchParentNode = $propertyFetch->getAttribute(AttributeKey::PARENT_NODE);
+
             if ($propertyFetchParentNode instanceof Assign && $propertyFetchParentNode->var === $propertyFetch) {
                 $uselessAssigns[] = $propertyFetchParentNode;
             } else {
+                // it is used another way as well → nothing to remove
                 return [];
             }
         }
diff --git a/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_anonymous_function.php.inc b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_anonymous_function.php.inc
index 43809d614d8..5bb7457db08 100644
--- a/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_anonymous_function.php.inc
+++ b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_anonymous_function.php.inc
@@ -2,10 +2,6 @@
 
 namespace Rector\DeadCode\Tests\Rector\Property\RemoveUnusedPrivatePropertyRector\Fixture;
 
-use PhpParser\Node;
-use PhpParser\NodeVisitor;
-use PhpParser\NodeVisitorAbstract;
-
 class SkipAnonymousFunction
 {
     /**
diff --git a/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_nested_closure.php.inc b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_nested_closure.php.inc
new file mode 100644
index 00000000000..3850c9a34cd
--- /dev/null
+++ b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/Fixture/skip_nested_closure.php.inc
@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+
+namespace Tests\Unit\Exceptions;
+
+use stdClass;
+
+class SkipNestedClosure
+{
+    private $mailer;
+    private $message;
+
+    public function setUp()
+    {
+        $this->message = new stdClass();
+        $this->mailer = new stdClass();
+    }
+
+    public function test()
+    {
+        $this->mailer->method()
+            ->with(
+                $this->anything(),
+                $this->callback(
+                    function () {
+                        $this->message
+                            ->expects($this->once())
+                            ->method()
+                            ->with($this->a(), $this->b());
+
+                        $this->call();
+
+                        return true;
+                    }
+                )
+            );
+    }
+}
diff --git a/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/RemoveUnusedPrivatePropertyRectorTest.php b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/RemoveUnusedPrivatePropertyRectorTest.php
index f2ca539b71b..a9ee020c9df 100644
--- a/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/RemoveUnusedPrivatePropertyRectorTest.php
+++ b/packages/DeadCode/tests/Rector/Property/RemoveUnusedPrivatePropertyRector/RemoveUnusedPrivatePropertyRectorTest.php
@@ -12,9 +12,10 @@ final class RemoveUnusedPrivatePropertyRectorTest extends AbstractRectorTestCase
         $this->doTestFiles([
             __DIR__ . '/Fixture/fixture.php.inc',
             __DIR__ . '/Fixture/property_assign.php.inc',
+            __DIR__ . '/Fixture/with_trait.php.inc',
             __DIR__ . '/Fixture/skip_anonymous_class.php.inc',
             __DIR__ . '/Fixture/skip_anonymous_function.php.inc',
-            __DIR__ . '/Fixture/with_trait.php.inc',
+            __DIR__ . '/Fixture/skip_nested_closure.php.inc',
         ]);
     }
 
diff --git a/packages/NodeTypeResolver/src/PHPStan/Scope/NodeVisitor/RemoveDeepChainMethodCallNodeVisitor.php b/packages/NodeTypeResolver/src/PHPStan/Scope/NodeVisitor/RemoveDeepChainMethodCallNodeVisitor.php
index 41a11fc35a1..5073bbfcbf2 100644
--- a/packages/NodeTypeResolver/src/PHPStan/Scope/NodeVisitor/RemoveDeepChainMethodCallNodeVisitor.php
+++ b/packages/NodeTypeResolver/src/PHPStan/Scope/NodeVisitor/RemoveDeepChainMethodCallNodeVisitor.php
@@ -16,9 +16,10 @@ use Rector\PhpParser\Node\BetterNodeFinder;
 final class RemoveDeepChainMethodCallNodeVisitor extends NodeVisitorAbstract
 {
     /**
+     * @warning might cause bugs with fluent interfaces like https://github.com/rectorphp/rector/issues/1646
      * @var int
      */
-    private const NESTED_CHAIN_METHOD_CALL_LIMIT = 10;
+    private const NESTED_CHAIN_METHOD_CALL_LIMIT = 15;
 
     /**
      * @var BetterNodeFinder
diff --git a/rector.yaml b/rector.yaml
index 399369c358b..5a4d0af1e24 100644
--- a/rector.yaml
+++ b/rector.yaml
@@ -17,4 +17,4 @@ parameters:
     php_version_features: '7.1'
 
 services:
-    Rector\CodingStyle\Rector\Namespace_\ImportFullyQualifiedNamesRector: ~
+#    Rector\CodingStyle\Rector\Namespace_\ImportFullyQualifiedNamesRector: ~
diff --git a/src/PhpParser/Node/Manipulator/PropertyManipulator.php b/src/PhpParser/Node/Manipulator/PropertyManipulator.php
index 70b9337d942..5c32229abf5 100644
--- a/src/PhpParser/Node/Manipulator/PropertyManipulator.php
+++ b/src/PhpParser/Node/Manipulator/PropertyManipulator.php
@@ -63,13 +63,13 @@ final class PropertyManipulator
         $nodesToSearch[] = $classNode;
 
         return $this->betterNodeFinder->find($nodesToSearch, function (Node $node) use ($property) {
-            // itself
-            if ($this->betterStandardPrinter->areNodesEqual($node, $property)) {
+            // property + static fetch
+            if (! $node instanceof PropertyFetch && ! $node instanceof StaticPropertyFetch) {
                 return null;
             }
 
-            // property + static fetch
-            if (! $node instanceof PropertyFetch && ! $node instanceof StaticPropertyFetch) {
+            // itself
+            if ($this->betterStandardPrinter->areNodesEqual($node, $property)) {
                 return null;
             }