I know this is a workaround and not a solution, but it let you continue working in the short term. If you make a vertical selection (holding down alt and then dragging down across lines), you can modify every line at once, plus the suggestions window doesn't come up:
Single quote typed at end of list:
Comma and single quote typed at start of list:
First comma removed from list (after coming out of vertical selection):
I'll have a chat with the rest of the team to see if we can get around your problem for good.