Append to template / New texture on flipped object cause faces to become transparent

[mcrimson974]

What are you trying to do, and what do you expect to happen?

Flip an object, and append/ create a new texture

What happens instead?

Some faces become transparent

Model format in which the issue occurs

bbmodel

Blockbench variant

Program

Blockbench version

4.9.4

Operating System

Windows10

Installed Blockbench plugins

No response

[JannisX11]

Steps to reproduce:

• Create a mesh
• Generate template on mesh
• Flip mesh on X axis
• Generate new mesh based on old
• Some faces become transparent