I'm not sure the ability to add tags to change a tags to has ever been supported. Other than deleting them, no one has (to my knowledge) ever asked for the ability to change a tags to some other tag.
Or perhaps the ability to enter new tags in the config dialog for a tags has changed at some point. There are no default setting for that tag -- mainly because I couldn't see the usefulness of changing a tags to something else.
I'll take a look.
In the meantime, you can edit TagMechanic's json preferences file to enable it.
Just change the empty
line to:
Code:
"a_changes": [
"span"
],
And save it. Then when you next launch the plugin, you should be able to change/add tags to the "a" tag's configuration. Just don't empty the list completely or it will probably disable edits again.