So for the last few versions,.. since 1.07 roughly I have witnessed this behavior on the launcher, it seems like the filter section doesnt work properly for names/text filter, I enter 1 word name of server and they show however if a friend uses the same word name they cannot see the server even after finding hundreds of others servers that dont even have the name in them, this is obviously a bug and really needs fixing, I been waiting for it to be fixed for so long so now Im letting you know the wheel is squeaking and needs attention asap.
Also a launcher crash when joining a server that has an updated version of a mod compared to client, crashes after you update mod and the rejoin server with updated mod, been present since 1.15.