Labyrinth Divine Font and Corrupted Gems

Snitchgog here with a reminder!

Excluding the Dedication level 83 lab, gem-altering crafts found at the Divine Font all disallow application to corrupted gems and come up with a message to explicitly state this.

The uncommon "Transform a non-Transfigured Skill Gem to be a random Transfigured version" is an exception.

Replication:
Prepare a 21/23 Firestorm gem and a 21/20 Vaal Firestorm gem, farm up a "Transform a non-Transfigured Skill Gem to be a random Transfigured version"

Expected behavior:
Craft fails with a message saying words to the effect "haha, you can only do things like that to corrupt gems in the Dedication lab"

Actual behavior:
Vaal Firestorm gives an error message. Firestorm becomes either Firestorm of Pelting or Firestorm of Meteors and remembers its 21/23 status.

I'm likely to leaguestart a Dedication lab runner if this is fixed, so it would be good to know. If this is actually the intended behavior, please adjust the text of the uncommon Divine Font craft to explicitly state this intent.

Video proof (recorded in the last days of patch 3.25, but still applies now) https://youtu.be/vnPm50AWhFw