Migrated Martial Artists - cannot upgrade Hollow Focus with Lesser Jewel orb

Hello,

i migrated to character Martial artist, to standard Runes of aldur league. All stuff, stash.

And if I want to use Lesser jeweller's orb, on Hollow Focus,
I get the message:
"items in remove only stash tabs cannot be modified". BUT, I moved - some days ago from those Remove only tabs, to new tabs, so this message is kinda strange.

So, I managed to upgrade the Falling Thunder ok.. but not Hollow Focus.

Is this a bug?

Thanks.

Hollow Focus is an ascendancy skill. It gains support slots with your character level.