Just adding on with the same issues as others. This polymorph variant does not work on my Alliance mage that acquired and used the Tome of Polymorph: Mosswool before the fix mentioned in the September 30th hotfixes. I opened a ticket and was told by the GM to add my info to the bug forums.
It does not appear in my spell book and I’m unable to /cast or use the variant in a macro. I, like others, already completed the “Easy Win” quest so I have no way to re-acquire the tome. Hoping they’re able to resolve this issue for anyone that used the tome before the fix.