Deviation from preregistration

I know tons of papers that deviate from their initial plan, but I am not aware of so many papers where this can be unequivocally found by comparing pre-registration and publication.

It has been mentioned recently and there seems also a formal analysis in the literature

We observed deviations from the plan in all studies, and, more importantly,  in all but one study, at least one of these deviations was not fully disclosed.

Further research required,