Bumping as this was not resolved in Patch 5 (and I can no longer edit the OP to add this information). They made Disengage an action (good!), but did not change Hide.
In fact, based on my brief testing this issue seems to be WORSE in Patch 5. Example: If you attack Lae'zel in the tutorial, after you end your turn hiding she runs straight into the Imp room and attacks everything in there unprovoked. It is only after the Imps are all dead that she will revert to "standing around" like the video shows until you kill her. This also happens with the Imps at the top of the stairs outside. Instead of standing around after you hide, they now run and attack the cultists working the cannons.
I guess you can make the argument that since you are hiding.. they don't know what attacked them and just zerg everything in the area instead. While that may make sense thematically, it is terrible for a video game and IMO an AI downgrade. However, any changes to the AI (like simply checking the PCs last known location when they hide and force a roll, as I suggested in OP) is a bandaid and does not change the underlying problem. Which is Hide as a Bonus Action.
New patch, new bump! Initial tests in patch 6 show some improvements. For the initial Imp battle, it seems the response to all allies hiding is for the Imp to take the 'Dash' action and investigate your location. Previously they would all stand around like the video in the OP. This is the "bandaid" fix I suggested in previous posts. Video:
For the record I still don't like Hide as a bonus action, but at least they are attempting to fix it breaking the entire game. Can't say for sure yet if this is a universal AI change.. we'll see as I test other battles.
I've also noticed that the "Plotting next move" seems to be a bit faster, which is nice. Lae'zel's actions (see quote above) do not seem to have changed since the last patch. She still rushes in to fight all the Imps if you hide after attacking her.
