Blurring pixel textures

[KoTeHok22]

I have 1 model and several textures for it, I upload a new texture, but it gets blurred.

The model was made in Blockbench and is shown normally, but after loading the new texture, it gets blurred.

How can this problem be solved? Is it possible to do this without creating a gltf model for each texture?

[danilokrulj]

Any chance you could upload the model and textures in question? It would help with identifying the issue.
At the moment my guess would be that something is wrong with the UV map? Not really sure.

Maybe also provide the code how you swap textures?