diff --git a/scrapy/commands/check.py b/scrapy/commands/check.py
index 1982d25c5..18eeebb7d 100644
--- a/scrapy/commands/check.py
+++ b/scrapy/commands/check.py
@@ -89,7 +89,7 @@ class Command(ScrapyCommand):
             for spidername in args or spider_loader.list():
                 spidercls = spider_loader.load(spidername)
 
-                spidercls._result = result  # type: ignore[assignment,method-assign,return-value]
+                spidercls._result = result  # type: ignore[assignment,attr-defined,method-assign,return-value]
                 spidercls.yield_seeds = yield_seeds  # type: ignore[assignment,method-assign,return-value]
 
                 tested_methods = conman.tested_methods_from_spidercls(spidercls)
diff --git a/scrapy/commands/fetch.py b/scrapy/commands/fetch.py
index 97eeeffa1..d1b0974ec 100644
--- a/scrapy/commands/fetch.py
+++ b/scrapy/commands/fetch.py
@@ -93,8 +93,8 @@ class Command(ScrapyCommand):
         async def yield_seeds(self):
             yield self._request
 
-        spidercls._request = request  # type: ignore[assignment]
-        spidercls.yield_seeds = yield_seeds
+        spidercls._request = request  # type: ignore[assignment,attr-defined]
+        spidercls.yield_seeds = yield_seeds  # type: ignore[method-assign,attr-defined]
 
         self.crawler_process.crawl(spidercls)
         self.crawler_process.start()
diff --git a/scrapy/core/spidermw.py b/scrapy/core/spidermw.py
index 7a6d9bafe..188b8dcba 100644
--- a/scrapy/core/spidermw.py
+++ b/scrapy/core/spidermw.py
@@ -325,7 +325,9 @@ class SpiderMiddlewareManager(MiddlewareManager):
         return dfd2
 
     @inlineCallbacks
-    def process_seeds(self, spider: Spider) -> Deferred[AsyncIterator[Any]]:
+    def process_seeds(
+        self, spider: Spider
+    ) -> Generator[Deferred[Any], Any, AsyncIterator[Any]]:
         self._check_deprecated_start_requests_use(spider)
         seeds = yield self._iter_seeds(spider)
         seeds = yield self._process_chain("process_seeds", seeds)