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Cyberbeing said:
https://yande.re/tag_alias doesn't function as expected.

If you attempt to add an alias which doesn't already exist as a tag, it creates a new general tag for the alias (which then needs to be deleted), and changes the type of the alias target to general (which then needs to be reverted).

Neither of these actions should occur, or rather it currently seems to be doing the exact opposite of what should be done in this case.
I was aware of this bug, but it doesn't happen too often since most of time we are combine two pre-defined (type) tags.