The bug
These two template models, used for spawners and trial spawners, use a negative-size cube for rendering inner graphics, which is unlike all other hollow cuboids in model files, which use six planes instead for the same effect.
This causes MC-266463, as while the cullface arguments are specified correctly, negative element sizes do not handle them correctly.
Using negative size cuboids appears to be discouraged, due to a change in 24w38a in which redstone torch models were changed to use the six planes approach:
Comparison of the model file:
Before:
After:
How to fix
Make these templates more like the powder snow model. I've attached a resource pack that does just this, fixing MC-266463 and MC-266536 in the process. Mojang have my full permission to use these resources to fix this issue if desired.
Attachments
Comments 2
Jingy, this is reporting something separate that will ALSO fix 266463, but fixing that does not nessicarily fix this. That report can be fixed by changing which cullface argument is used as well, whereas this is reporting a model usage in the game that mojang seemingly deemed not a good idea to have (per the quoted changelog of 24w38a). This could also be WAI/WF while that report gets a fix.
This deserves its own report/resolution separate from 266463.
Thank you for your report!
However, this issue is Invalid.
This is better suited for a comment on MC-266463 as to how that issue could possibly be fixed.
That issue is already triaged, and I see minimal benefit in confirming this report which is a feature/change request feature request, only for the sake of adding a 'causes...' link towards MC-266463.
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