Overlay doesn't work on export

Hello! Some time ago, I had exported my mod for my friend to try it out. However, when I went to check if everything works, I noticed that there were some overlays missing. This behaviour is different to the one in MCreator, where all the overlays show. Is there a possible workaround or fix to this?

Here is an image of this: https://imgur.com/sKS7fxB (left is the exported mod, right is in MCreator)