Add regression test for #2294

Closes phpstan/phpstan#2294

Author: phpstan-bot

tests/PHPStan/Analyser/nsrt/bug-2294.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types = 1);
+
+namespace Bug2294;
+
+use function PHPStan\Testing\assertType;
+
+function (): void {
+	$entries = ['A' => null, 'B' => null];
+
+	$entries2 = [];
+	foreach($entries as $key => $value) {
+		$entries2[$key] = ['a' => 1, 'b' => 2];
+	}
+	assertType("array{A?: array{a: 1, b: 2}, B?: array{a: 1, b: 2}}", $entries2);
+};