I want to share my frustration here. I've encountered the same problem twice, once while updating to version 1.10.8, and again while switching profiles. I have 2800+ mods with a ton of texture conflicts and I have set up manual overrides for almost all of them. The first time this happened the exclamation mark was still there and I could use it as a reference. This time I didn't have the same luck. I spent the last two weeks fixing and redoing all the work I previously did, and now I have to do it again.
Perhaps consider sending a notification through the site or app to alert users about this issue.
Thank you for your work. I hope this issue can be resolved soon.