Auto-exit turn based mode after sneak attack...WHY??

Those of you who like to buff up the whole team in turn-based mode, sneak, and do one big turn of sneak attacks for big damage probably know what I'm describing in the title, but to be clearer:

1. I have the whole party sneak

2. I engage turn-based mode and apply all my various temp buffs (haste, speed pots, bless, etc.)

3. I sneak attack with a member of the party, and...

4. All 3 other members of the party automatically exit turn-based mode, the buffs run out, and I have to either reload a save or accept that I just wasted a ton of resources and I'll have to approach later encounters at a disadvantage

I've been banging my head against a wall trying to figure out a way to prevent this from happening. From what I understand, this has been an issue that the devs have been aware about since the BETA!!! I don't see anything in the options about this, and I've scoured years of forum posts and Reddit posts about this issue, yet it seems nobody can offer any advice besides "quickly swap to your other party members and put them in turn-based mode," which doesn't really work for me because I'm on a Steam Deck -- between the slightly sluggish performance and general clunkiness inherent with controllers in a game like this, there's no way I can consistently get all 4 party members in on an attack without losing a turn or two of buffs.

Does anyone have any techniques they use to remedy this kind of thing? Maybe a mod that forces turn-based mode globally once enabled?

Inb4 "It doesn't matter! The game isn't that hard!" Yes I am aware, but I like playing optimally (and FWIW this is my first playthrough, I'm on Tactician, and I've never played DND or other 5e games before, so this is all new to me). I like the feeling of doing a few minutes of meticulous setup and wiping out a boss + its minions in two turn cycles and this issue is severely hampering my enjoyment as I approach the end of Act 2 and find myself with many options for approaching battles.