In CQ2, gctome seems to be missing on some spots.
In top left green section with King Lot there is a tile you need to step on to proceed.
My gc (undead companion to be exact) didn't transport.
Tile in corner at Imprisoned witch didn't transport him either.
Tile near King Uriel to this witch did transport him, he went without me, so no idea.
Tile to Caradac's Mage from King Uriel: no uc.
Tile to proceed to the dogs: uc walked in, couldn't test at that point.
Tile in locked part left top to exit portal: gctome worked.
Exit portal (to start of next CQ or exit) worked.

Didn't follow in lab 8 grolm pits either.

Might be those step on tile type of portals that won't use /gctome for now.
It is very hard if you specifically build a GC hara.

I didn’t have any issues with UC following in lab 8 to grolms. Actually it was somewhat of a struggle to keep him from walking into them.