Hi,
I tried to import some textures with the new option "Texture Templates", but when I created a texture with the texture maker, I didn't have the texture into the Templates.
So, I search, and I made some tests, and I found that when we import textures for the option "Texture Templates", they are saved into the C:\Users\YourUser\.mcreator\templates\texturemaker, and not into C:\Users\YourUser\.mcreator\templates\textures\texturemaker.
So, when textures are in templates\texturemaker, we can only see them in the User Preferences (We can't use them.), and when they are into templates\textures\texturemaker, we can use them, but we can't see them in the user preferences.
So, can you just save textures also in templates\textures\texturemaker ?
Issue comments
As I can't recreate a ticket for the moment to post an other bug, I just put the link here. I think it's an important bug. https://mcreator.net/forum/53991/blocks-dont-generate-nether-and-end-ore
I can confirm this bug. Thank you for in-depth explanation. It will be fixed in 1.9.2.