ender.properties inside My Pack\assets\minecraft\optifine\anim\ causes a crash

The file contains

x=119
y=159
w=98
h=98
to=textures/entity/chest/ender.png
from=textures/block/nether_portal.png

Expected behavior
Animation might be outdated, to verify, but I expected a warning, not crash

Which Minecraft versions does this bug affect?
1.21

Mod loader
Which mod loaders does this bug affect?

• Forge
• Fabric

Mods list

Resource pack
Its a mix of homemade files and existing packs files, a mix, legally cannot share

This issue is specific to animation files where the texture size is not a multiple of the frame size. It has been fixed in MoreMcmeta 4.5.0.