Bug overview description.
Bug: Tag scripting randomly deletes previously added tags from a post. Appears to only affect tags you've added yourself, ones added by other users are left alone.
Expected behavior: To have the site add the tags in your script, not deleting anything unless you've specifically ordered it to.
Actual behavior: The scripted tags get added, a varying amount of previously added tags (unrelated to the newly added ones) will get deleted. Not just from the most recent edit, sometimes it seems to grab two previous edits at once and nukes all their tags.
Steps to duplicate: Use a tag script. Duplication isn't extremely reliable, it seemingly strikes when it feels like it, but way too often to ignore.
https://e621.net/post_tag_history/index?post_id=863109
^ Example, though it's happened to me on nearly all of this comic's pages.
What part(s) of the site page(s) are affected?
Tag Scripting
What is the expected behavior?
Tag scripts should apply correctly without dropped tags.
What actual behavior is given instead?
Tags can be randomly removed when the tag script applies.
Time of incident. (If applicable)
N/A
Can you reproduce the bug every time?
No
What steps did you take to replicated this bug?
N/A
Errors or other messages returned. (If any)
N/A