Some messages do not load unless you clean up the message cache. The problem can manifest again within minutes from a cleanup
Additional details:
Pic. 1, 2: I noticed two messages missing from a topic on Android. So I went to settings and cleaned up the message cache. This made Telegram re-load everything, and the missing messages appeared
Pic. 3, 4: Not even 5 minutes later some messages are missing in another chat
Here in both cases the missing messages were sent by me from my PC and were not showing on my phone. Previously the same thing happened occasionally (through years) with messages from other people, usually if I passed through a place with bad cellular connection (which should not cause Telegram to lose those messages and never try to load them later)
Steps to reproduce
Send some messages from a PC
Open the same chat on Android
Some messages may be missing, and they will never load unless you clean up the cache
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3.1. Close the app (just go to the home screen, don't kill it)