Avoid list second slot unavailable

I have a problem where I cannot add a second player to my avoid list. Only one person is avoided, but if I try to add a second one, error about there being too many players on the list comes up.

This happened once I added a person in the same group as I currently was to the avoid list. Also this person possibly was a friend of a friend (on the friends list of a person on my friends list). I removed that person from the avoid list later, after we were no longer in the same group, but I could not avoid any new players after that.

Due to nature of the bug I cannot replicate this by myself, nor do I want to if it means it bugs out further and I lose even that one slot in my avoid list. Please help.

Here is a short video showing the bug
´https://youtu.be/3hCSnlICi_A´