Was looking into some dragon hybrid tags and found a bulk bot edit was adding dragon and mimic_dragon to a lot of posts where none of them are presented.
Topic: Incorrect tags were bulk added
Posted under Site Bug Reports & Feature Requests
https://e621.net/tag_implications/10779
Interesting, it looks like for some period of time around 2 years ago, hybrid was implying mimic_dragon, and it took the combined efforts of Nimmy and Kira to fix it. Never seen an implication "retired" before.
watchdog22 said:
Was looking into some dragon hybrid tags and found a bulk bot edit was adding dragon and mimic_dragon to a lot of posts where none of them are presented.
It probably wasn't the bot. When an alias or implication request is accepted (even if later rejected), the target tag is added to the post, but the Post Changes page shows the next user/bot that edits the post's tags as adding the tag even though it was already there. It just so happened that the bot ran after the implication erroneously added the tag to those posts, making it look like it added them.