How could this edit (I rolled back immediately), get any approves? Please look into the robo-approvers responsible for the approval of the vandalising edit. Did any of you see such activity recently?
The review of the edit in question (suggested by Blind Schleiche) is found here.
What I believe happened in this case, however, was a race condition--nothing malicious. Notice that the OP edited their post at time
23:42:21, and the edit was approved at
23:43:41. I think that, just after Blind Schleiche opened the "edit" page and started editing the post, the OP edited their question. Blind Schleiche then submitted their re-tagging suggestions. Since Blind Schleiche submitted second, their edit would overwrite the OP's edit.
I am led to believe this because Blind Schleiche's edit essentially rolls back the OP's edit from V2 to V1 (with regards to content), but simply adds tags.