I don't think I can help you much with this.....so I will dm you a link of their discord...there they will help you with all the problems you may face...
it is a frequent problem....and it has happened to many devices using brunch.... these drivers aren't in the actual cros img thus this happens..all these drivers are additional drivers added by sebanc. thus they don't play well with the gui but work with cli..
btw...the cmds are
"bluetoothctl" in the shell..
" scan on"
"connect (the device id) "
all of these stuff is general linux....so you can just google it
@mr_paradox the bluetooth has a bit of a problem......you need to use the terminal to pair the bluetooth devices....once paired you can connect to the device using gui...