What time frame do you mean by “used to be”? At what point did they worsen? Bots have not received any major updates or changes for a long time. The last significant bot update was in Patch 4.2.1 on 2021-02-10.
Many of the bot bugs reported recently are actually old ones that new or returning players are not familiar with. The Bot Improvements - Combat mod page comments section is a good example of this, a lot of (probably new or returning) players there are blaming the mod for vanilla game bot bugs that have been around for years.