diff --git a/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php b/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
index aee57db63..43ddf267a 100644
--- a/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
+++ b/src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php
@@ -215,10 +215,9 @@ class ReflectorVisitor extends PhpParser\NodeVisitorAbstract implements FileSour
 
             $functionlike_types = [];
 
-            if ($this->functionlike_node_scanners) {
-                $functionlike_node_scanner = end($this->functionlike_node_scanners);
+            foreach ($this->functionlike_node_scanners as $functionlike_node_scanner) {
                 $functionlike_storage = $functionlike_node_scanner->storage;
-                $functionlike_types = $functionlike_storage->template_types ?? [];
+                $functionlike_types += $functionlike_storage->template_types ?? [];
             }
 
             $functionlike_node_scanner = new Reflector\FunctionLikeNodeScanner(
@@ -341,8 +340,7 @@ class ReflectorVisitor extends PhpParser\NodeVisitorAbstract implements FileSour
                 $template_types = $classlike_storage->template_types ?? [];
             }
 
-            if ($this->functionlike_node_scanners) {
-                $functionlike_node_scanner = end($this->functionlike_node_scanners);
+            foreach ($this->functionlike_node_scanners as $functionlike_node_scanner) {
                 $functionlike_storage = $functionlike_node_scanner->storage;
                 $template_types += $functionlike_storage->template_types ?? [];
             }
diff --git a/tests/Template/FunctionTemplateTest.php b/tests/Template/FunctionTemplateTest.php
index 20b03212d..be655d688 100644
--- a/tests/Template/FunctionTemplateTest.php
+++ b/tests/Template/FunctionTemplateTest.php
@@ -1402,6 +1402,37 @@ class FunctionTemplateTest extends TestCase
                         }
                     }'
             ],
+            'doublyNestedFunctionTemplates' => [
+                '<?php
+                    /**
+                     * @psalm-template Tk
+                     * @psalm-template Tv
+                     *
+                     * @psalm-param iterable<Tk, Tv>                $iterable
+                     * @psalm-param (callable(Tk, Tv): bool)|null   $predicate
+                     *
+                     * @psalm-return iterable<Tk, Tv>
+                     */
+                    function filter_with_key(iterable $iterable, ?callable $predicate = null): iterable
+                    {
+                        return (static function () use ($iterable, $predicate): Generator {
+                            $predicate = $predicate ??
+                                /**
+                                 * @psalm-param Tk $_k
+                                 * @psalm-param Tv $v
+                                 *
+                                 * @return bool
+                                 */
+                                function($_k, $v) { return (bool) $v; };
+
+                            foreach ($iterable as $k => $v) {
+                                if ($predicate($k, $v)) {
+                                    yield $k => $v;
+                                }
+                            }
+                        })();
+                    }'
+            ],
         ];
     }