The chats are unavailable to be shown due to being "too long"

Hi @ZhurinovBeket! I’ve also been having a similar issue (though I do seem to manage to access the affected conversations via the app version for some reason).

Wanted to let you know that there’s another topic thread (opened a few days ago) where other people also reported having the same issue (called "Regression: Long conversations that previously loaded are now completely inaccessible for many users") that you might want to keep an eye on in case anything new gets reported there.

Fingers crossed for a fix soon.