Thanks for this great mod. It fixes sand and glass incompatibilities in my mod setup by unifying them via spoilage, which is imho a good way to handle this.

However, after every update to KR2SO, and possibly other sand related mods, buildings that previously used the correct sand or glass icons are migrated to the spoilable item icon instead. This affects not only circuit icons but also inserter and loader filters, making it very tedious to fix manually.
Is there a way to automatically remap or overwrite these migrated icons, or a console command to fix this after an update?

I'm not sure how to fix that nicely. If anyone has any ideas, I'd be happy to implement it, it's just not something I see a way to do cleanly. Ideally entity migration would also migrate signals for that entity. Did you actually see anything spoil to a new type? That's just a backup convenience, the migration file when you first loaded your save should have reported converting large amounts of kr-sand into sand.

I don´t think it is possible to actually see anything spoiling, since it spoils in 0s. I do assume it does spoil though, since the migration says under "changed items" "sand->kr-sand" not the other way around. Since nobody else reported this problem it might be something that is quite specific to my rather large mod setup.
The "bad" icon in the filter settings is a sack of sand, while the items produced are a pile of sand, if this is any help. I´m not entirely sure which is the normal sand and which is the kr-sand.