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@SDPhantom
Thank you for pointing out and explaining one of the major functional changes that followed TBC. I wish I had a list of such changes tbh
Coming from retail presents a challenge in light of all the changes that lie inbetween TBC and Shadowlands!
However, the issue I've been describing is less about shifting between forms and more about cancelling the form I'm already in...
I finally realized that the issue was with the /cancelform itself... Turns out that you need to use /cancelaura to cancel the form itself...