I noticed a strange behaviour with my models if I see them from my OPPO Realme 5 Pro device in https://gltf-viewer.donmccurdy.com/.
The problem is in the metalness value that I set to 0 but the models appear completely metallic. This happens only with my OPPO device, when I use other Android devices the models appear correctly. I always use chrome as browser. I noticed also that if I remove the normal map from the model the metalness returns correct also in the OPPO device.