Expected Behaviour
I modelled and textured a train with Blockbench and tried to load it in game. Everything worked like it's supposed to be, except for the handrails. The handrails looked like this on Blockbench:

However, they looked like this when loaded in game.

I made sure that the exact texture and model gets loaded and I uploaded the model and texture multiple times yet the same thing happens over and over again.

Environment

• Minecraft Version: 1.16.5
• Installed Mods:
  

Additional Information
I'm Mei Fwong#4462 by the way