Had to do a restore to a previously saved version of my page because of another bug that deleted most of my styles. This scrambles all collection IDs (and item IDs), so all API connections had to be remade. Finally did that and then I noticed none of my collection lists were displaying.
Turns out, if you do a restore, the collection lists won’t get the new IDs from multi-reference field items. Everything is just displayed as “Tags contains Deleted Item”. So now I get to go through all 148 collection lists on my various pages and fix them