Like you, my workflow totally depends on using named groups in the Outliner so It’s a big deal to me as well. My ‘fix’ is; I don’t use 2023.
It will be fixed at some point but there’s no saying how long it will take. A first update for 2023 was released a week ago so I guess it will take a few months before a next round of fixes is released…
@kevin58 he’s describing this bug in the second image in this post SU Outliner 2023 seems different - #9 by maxB