The maintenance is complete, and the PTS is now back online and patch 12.0.2 is available.
Maintenance for the week of April 27:
· [COMPLETE] EU megaservers for maintenance – April 27, 2:00 UTC (April 26, 10:00PM EDT) - April 27, 16:00 UTC (12:00PM EDT)
· [COMPLETE] NA megaservers for maintenance – April 27, 3:00AM EDT (7:00 UTC) - 5:00PM EDT (21:00 UTC)
Skill Scrolls are still usable with special skill bars
When you try to use a Skill Scroll while in Werewolf form, you see this message:

But, when you use a Skill Scroll as a Werewolf Behemoth (Stone Garden variant), it works:

It also works as a watchling in the Infinite Archive:

It even works while wielding Volendrung:

I believe it would also work while transformed into a Skeevaton in Frostvault, while transformed into a goat in the Infinite Archive, and possibly in various other dungeons and story content where you're not normally supposed to have access to the skills from these Skill Scrolls.
As it stands, Werewolf is the only special skill bar prohibited from using Skill Scrolls.
@ZOS_JessicaFolsom
PC/NA — Lone Werewolf
Werewolf Should be Allowed to Sneak Prowling added in Update 50!
Please give us Werewolf
Skill Styles (for customizing our fur color) Added in Update 50!,
Grimoires/Scribing skills (to fill in the holes in our builds), and
Companions (to transform with).