Ran into the bug again, and submitted a report.
I think I've narrowed it down a bit more and it seems that it has something to do with how recently you've put a character on active duty - or more precisely: It seems to happen to the "new guy" when you swap one character out for another.
I've only swapped out single characters on my current run, so I don't know what would happen if I swapped out more than one at a time, but:
Last night, I removed Gale from the party and put Wyll on ... and then Wyll's reaction-tab was missing.
Just now, I left Wyll at camp and put Gale back on duty while at camp and before taking a long rest. Then I long rested, left camp and now Gale's reaction-tab is missing.
Also: Another effect seems to be that the character whose reaction-tab doesn't show loses their voice and other audio. Last night Wyll would engage in party banter with SH while walking around the world, but only SH's voice could be heard (Wyll's line still showed up as subtitles and in the events-log). Also: When I used Wyll to loot containers, the opening and closing sounds associated with those containers were missing and I also never heard any of his voice reactions when clicking on him or giving him orders.
Same happened with Gale just now after I had taken a long rest and left camp. No reactions-tab, no voice acknowledgements and no spoken lines from him when using spells.
EDIT: Since I'm doing an honor-run, I can't tell if a simple quicksave and -load would do the same, but for me at least, exiting the game (creating an auto-save), then re-starting and loading the auto-save fixes the issue. Sadly, this is only temporary and the reacion-tab and audio will glitch again as soon as you change party-composition.
S.
Last edited by 1Sascha; 09/12/23 08:36 PM.