Hello,
if anybody has the same problem, you may check your versioning config. I had the same error after updating and found out that the folder “class/model” became “class/Model”
diff -rq wp-content/plugins/shortpixel-image-optimiser ../clone/wp-content/plugins/shortpixel-image-optimiser
Only in wp-content/plugins/shortpixel-image-optimiser/class: Model
Only in ../clone/wp-content/plugins/shortpixel-image-optimiser/class: model
You can change your versioning settings to not ignore case-sensitive files
