Hey there! These issues have been pevelant for at least the last year (presumably forever). I just assumed they were being worked on or someone else already would have reported them. Myself and people I play with regularly experience issues with custom games. I will list 2 of the common issues below to the best of my ability:
Lobby freezing after custom game ends:
This happens to me about half of the time I decide to host a custom game. Every once in awhile I warm up with an octagon match and I will host it and open it up to one other player. When the match concludes (game ending score is met) the game will return us to the custom lobby screen. I can see all present gamertags. However, I’m unable to make any changes to the settings, can’t move the UI, can’t open roster, I can not start the match again, I can not rotate through the menus with the bumpers. Nothing on the screen works. The majority of the time I will need to hard quit the game and load back in. SOMETIMES I regain control of the lobby after the other person leaves the fireteam but only after they leave.
Occasionally can’t set team colours:
Every other week we will play 8’s customs. During the team select process we will often find one of the players in unable to select a particular team colour. They can scroll to it and select it but are instantly reverted to their previous team colour. Rotating fireteam lead does not always resolve the issue. The only resolution is to recreate the lobby and try again or the fireteam lead needs to switch to forge mode and back in the lobby screen. Sometimes multiple times.