I'm an admin on hrwiki and I recently wrote a script to hide multiple revisions at the same time from the contributions page.
The script is https://hr.wikipedia.org/wiki/Suradnik:Ivi104/Skripte/Sakrivanje-svih-izmjena-suradnika.js (in Croatian).
I'm using action=revisiondelete and multiple revision ids (pipe separated). The API sometimes hides 1 or 2 revisions and returns an error "revdelete-modify-missing" on the others. I don't know why the error happens and there's nothing in the official docs.
Could someone please look into this?