The fix for the fire animation released in the latest version only works for the Bloomery; the Wither Forge's fire still doesn't animate when VanillaFix is installed and the textureFixes option is enabled.
I assume this issue can be fixed in the same way as the previous one.
Tested with:
Minecraft: 1.12.2
Forge: 14.23.5.2838
Dropt: 1.16.1
Pyrotech: 1.4.21
Athenaeum: 1.17.4
VanillaFix 1.0.10-99