Mold not accepting any molten metals

[KDLynch]

Having a bit of a baffling moment here... I cannot figure out where I've gone wrong with a clay mold.  I can clayform it just fine, and do end up with the *-fired block, but cannot pour any metal into it via a crucible like I can with any other mold (have had a vanilla mold right next to it which works fine).  It does show the "pour molten" tooltip when hovering over it like other molds, but nothing ever pours, the 0/200 stays static, et al.  I've checked the json against other molds and cannot see where I've made the mistake. If anyone has any ideas, I'd be appreciative.
I've attached both the blocktype and shape jsons for the mold.  

metalplate.json metalplatemold.json

[Brady_The]

8 hours ago, KDLynch said:

If anyone has any ideas, I'd be appreciative.

The "fired" variantgroup requires to be called "materialtype".

https://github.com/anegostudios/vssurvivalmod/blob/84c80e85f36e31d3b6454021da0fbbba4cba71a3/BlockEntity/BEToolMold.cs#L37

[KDLynch]

thank you so very much! figured there was something simple throwing me off.  now to fight with the various bounding boxes/rotations/fillquads to wrap this little thing up.