BUG - checkered texture on objects when converting project

Hello,

lately I noticed when converting a project that had been created in 2024 or 2025.1 version, some objects have a checkered texture, and we can’t interact with it anymore (we can still select them, but impossible to assign another material, impossible to sample it….)

is there a workaround ? re-syncing with datasmith does not fix anything.

see screenshot attached