Try

Author: VincentLanglet

src/Rules/Arrays/NonexistentOffsetInArrayDimFetchCheck.php

@@ -78,6 +78,11 @@ public function check(
 
 			$allowedArrayKeysTypes = AllowedArrayKeysTypes::getType();
 			foreach ($flattenedTypes as $innerType) {
+				if ($allowedArrayKeysTypes->isSuperTypeOf($innerType)->no()) {
+					// Will be reported by InvalidKeyInArrayItemRule
+					continue;
+				}
+
 				if (
 					$this->reportPossiblyNonexistentGeneralArrayOffset
 					&& $innerType->isArray()->yes()
@@ -95,6 +100,7 @@ public function check(
 					$report = true;
 					break;
 				}
+
 				if ($dimType instanceof BenevolentUnionType) {
 					$flattenedInnerTypes = [$dimType];
 				} else {