Bug report

Mod version: belt-quality 0.1.11
Factorio version: 2.0 (or later)

Error description:
The game fails to load the mod with the following error:
Error while loading item prototype "umr_underground_belt_entity-quality-1" (item): Key "icon" not found in property tree at ROOT.item.umr_underground_belt_entity-quality-1

It seems that the item prototype umr_underground_belt_entity-quality-1 is missing the mandatory icon property. Without it, the mod cannot be enabled.

Temporary workaround (for testing):
I created a small fix-mod that adds a fallback icon (e.g. from base/graphics/icons/underground-belt.png). After that the mod loads fine.

Suggestion:
Please add an icon (and possibly icon_size, icon_mipmaps) to that item prototype.

Let me know if you need more details or testing. Thank you for maintaining the mod!