I hope this was reported as a bug - I think I encountered other broken stacking rules, but I haven'ty played for about 8 months, so can't remember the situation. Thanks to all the folks still testing and looking out for inconsistencies - hopefully there will be something closer to 5E RAW at the end.
Just to be clear, I don't mind if it's not RAW.
I'm okay playing it that way if it's the intended design by Larian, but if it's an oversight that Larian means to correct, then I don't want to build a character around that concept, if that makes sense.
I'm trying to come up with the character I want to play for when the full game releases.