Assertion failed on expression error from lightmap baking

Assertion failed on expression: packedSizes == sizes || packedSizes.x == kDefaultSystemAtlasSize || packedSizes.y == kDefaultSystemAtlasSize

This never happened before and even after a reimport and an upgrade to a newer version, this error persists. Has anyone else had to deal with this and ended up fixing it?

Bumping to try to get help