Harald :This sounds as if you are encountering problems with your .meta files (or your version control system). Are you sure you are both using the same meta files for the affected assets?
If yes, could you maybe describe in more detail what your and your colleagues performed steps are, maybe you could also post the commit diff here that leads to the deleted material.
Hello there!
Ok so unfortunately we are using Unity Collab for this project (I'm the only one that knows how to use Git so we tried a solution that could fit the entire team) and turns out that sucks quite a lot. The problem is that I don't know how to retrieve the diffs from Collab (I'm gonna look into it pretty soon). Also, I would expect it to work as intended with the .meta files since is developed by Unity themselves, but hey, apparently it is no.
The only step that leads to this problem is when the material is changed (e.g. adding a new normal map texture), then after the push from that PC, if someone else pulls onto his/her machine, the material is gone.
Last info: we do not use spine material for sprites, we use the standard one with roughness setup.
Thanks!