PoE2 XBox Controllers + Couch co-op shoulder buttons stop working correctly

100% repro

PC with XBox wireless adapter (3rd-party, not MS wireless adapter); not a BT connection

*Have two players sign in with couch co-op (1 player account, 1 guest)
*2 xbox one controllers running on an xbox wireless adapter
*get an item that can be salvaged with the salvage bench (socket/quality)
*P1 goes to bench; salvage item (not sure if salvaging is strictly necessary)
*open inventory (left tiny button on controller)
*try to use shoulder buttons; inventory screen will close instead of cycling to next tab

This happens in Act 3 for sure, seems to have been happening in other acts as well, but it took a while to understand the repro; it just seemed like the buttons would stop working.

To fix, players must exit to character select and then re-enter the game.

Only seems to happen with couch co-op with two XBox controllers; no idea if it happens with other controllers.

Oh, and maybe a separate bug, but if two players are playing with controllers as described above, occasionally (30% of the time?) P1 opening the salvage bench will open P2's inventory (!).