While upgrading one barracks, Bot doesn't train troops anymore

[Supreme Leader]

If you upgrading your barracks you need to check the option (Train by barracks) thats the only way

That's not true. As I said above if you unclick the Barracks number that is upgrading the bot will skip over it. I've been using it that way since the update and no issues.

1 Barb, 1 Arch, 1 Giant.

Yea thats what i was trying to say you can do that but you cant use custom army because it will not work you need to use train by barracks option
Joeke obviously using custom army otherwise it wouldnt get stuck at waiting for army to finish