The "texture" variables for each face of the heavy core's block model lack the "#" prefix as seen in any other block model.
It is unknown if this has any effect on its in-game appearance.
Fixed model attached.
MC-270059
Heavy Core model face texture variables are not prepended with a "#"
Open
10
(Unassigned)
1217059
Confirmed
Expansion B
Low
Textures and models
block
24w13a, 24w14a, 1.20.5 Pre-Release 1, 1.20.5 Pre-Release 2, 1.20.5 Pre-Release 3, ..., 1.21.11 Release Candidate 3, 1.21.11, 26.1 Snapshot 1, 26.1 Snapshot 2, 26.1 Snapshot 3
Retrieved
This is the only block model to have any
elements[0].faces.texturenot startwith#.Can confirm in 1.21.11-pre-4.