Bug sudden copytexture error spamming the console

Unity has its ways to destroy my soul.

There is this new error spamming the console when I open my project in unity. I highlight open and not running, it appears right after the unity window appears. The error has no call stack, however I get a similar error from the built client at the start up and there the stack suggests something about the blue noise (which we don't use directly)

 

Like suggested in quite old bug reports, it has something to do with the quality settings half res texture. the error disappear if I put all my quality settings to full res.

However we are using these settings for more than 1 year now, why has the error suddenly appeared now?