diff --git a/tests/_files/test_animation.py b/tests/_files/test_animation.py
index a312d3575cd..0f581259db9 100644
--- a/tests/_files/test_animation.py
+++ b/tests/_files/test_animation.py
@@ -233,7 +233,8 @@ async def test_send_all_args(self, bot, chat_id, animation_file, animation, thum
         assert message.animation.file_unique_id
         assert message.animation.file_name == animation.file_name
         assert message.animation.mime_type == animation.mime_type
-        assert message.animation.file_size == animation.file_size
+        # TGs reported file size is not reliable
+        assert isinstance(message.animation.file_size, int)
         assert message.animation.thumbnail.width == self.width
         assert message.animation.thumbnail.height == self.height
         assert message.has_protected_content
diff --git a/tests/test_bot.py b/tests/test_bot.py
index 379addbd859..426b5aa6637 100644
--- a/tests/test_bot.py
+++ b/tests/test_bot.py
@@ -2372,15 +2372,12 @@ async def test_forward_protected_message(self, bot, chat_id):
         assert all("can't be forwarded" in str(exc) for exc in result)
 
     async def test_forward_messages(self, bot, chat_id):
-        tasks = asyncio.gather(
-            bot.send_message(chat_id, text="will be forwarded"),
-            bot.send_message(chat_id, text="will be forwarded"),
-        )
-
-        msg1, msg2 = await tasks
+        # not using gather here to have deteriminically ordered message_ids
+        msg1 = await bot.send_message(chat_id, text="will be forwarded")
+        msg2 = await bot.send_message(chat_id, text="will be forwarded")
 
         forward_messages = await bot.forward_messages(
-            chat_id, from_chat_id=chat_id, message_ids=sorted((msg1.message_id, msg2.message_id))
+            chat_id, from_chat_id=chat_id, message_ids=(msg1.message_id, msg2.message_id)
         )
 
         assert isinstance(forward_messages, tuple)
@@ -3939,14 +3936,12 @@ async def test_copy_message_with_default(self, default_bot, chat_id, media_messa
             assert len(message.caption_entities) == 0
 
     async def test_copy_messages(self, bot, chat_id):
-        tasks = asyncio.gather(
-            bot.send_message(chat_id, text="will be copied 1"),
-            bot.send_message(chat_id, text="will be copied 2"),
-        )
-        msg1, msg2 = await tasks
+        # not using gather here to have deterministically ordered message_ids
+        msg1 = await bot.send_message(chat_id, text="will be copied 1")
+        msg2 = await bot.send_message(chat_id, text="will be copied 2")
 
         copy_messages = await bot.copy_messages(
-            chat_id, from_chat_id=chat_id, message_ids=sorted((msg1.message_id, msg2.message_id))
+            chat_id, from_chat_id=chat_id, message_ids=(msg1.message_id, msg2.message_id)
         )
         assert isinstance(copy_messages, tuple)
 
@@ -4059,7 +4054,7 @@ async def test_replace_callback_data_copy_message(self, cdc_bot, chat_id):
             bot.callback_data_cache.clear_callback_data()
             bot.callback_data_cache.clear_callback_queries()
 
-    async def test_get_chat_arbitrary_callback_data(self, channel_id, cdc_bot):
+    async def test_get_chat_arbitrary_callback_data(self, chat_id, cdc_bot):
         bot = cdc_bot
 
         try:
@@ -4068,7 +4063,7 @@ async def test_get_chat_arbitrary_callback_data(self, channel_id, cdc_bot):
             )
 
             message = await bot.send_message(
-                channel_id, text="get_chat_arbitrary_callback_data", reply_markup=reply_markup
+                chat_id, text="get_chat_arbitrary_callback_data", reply_markup=reply_markup
             )
             await message.pin()
 
@@ -4078,7 +4073,11 @@ async def test_get_chat_arbitrary_callback_data(self, channel_id, cdc_bot):
             )
             assert data == "callback_data"
 
-            cfi = await bot.get_chat(channel_id)
+            cfi = await bot.get_chat(chat_id)
+
+            if not cfi.pinned_message:
+                pytest.xfail("Pinning messages is not always reliable on TG")
+
             assert cfi.pinned_message == message
             assert cfi.pinned_message.reply_markup == reply_markup
             assert await message.unpin()  # (not placed in finally block since msg can be unbound)

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