removing blocks from groups won't save when game exits

I have a bug where when I remove a block(s) from a group, those blocks will reappear in the group when I save and reload the game.

I'm trying to make a proof-of-concept prototype flyer that uses event controllers, timers, and a bunch of groups to make thrusters on separate subgrids match what the thrusters are doing on the main grid. I accidentally put the thrusters of the main grid into the control groups for firing the subgrid thrusters, and so I removed them. This worked, and the prototype was a success. The following morning (irl), I hopped back into the world only to find that the prototype no longer functioned, and that the thrusters on the main grid were back in the control groups for the thrusters on the subgrids.

I haven't experimented with it too much to see how I can replicate it, but I took the following screenshots to demonstrate my problem:

I then proceed to save and reload the game...

...and just like that, they've magically reappeared in the control groups.

I've attached both the blueprint file and the world file to this bug report. To replicate the bug in the world, just select one of the thruster groups in the test flyer, and then ctrl-click on any selected thrusters that appear white in the menu (white = on main grid). There are control groups for all six directions, plus 2 duplicates of each group for timer shenanigan reasons, but it happens on all 18 of them. After saving the updated groups, it will work while you're in the world, but once you save and load the world, the groups will go back to having the incorrect thrusters in them.

My guess is that updated groups don't get written to the save files, since their names don't change and no new instances are created. Hoping this will get patched soon since I'm not looking forward to having to reprogram the 540+ actions I have put in the timer blocks using these groups lol