If so, then it’s necessary to find the problematic part of the shader. In your linked warning message the errors occurs in the dithering shader chunk although the shader is not configured to use the particular code since the related define DITHERING is not set. Same for the other warning that refers to a line related to area lights. But it looks like no area lights are defined in your scene. Probably the line numbers are not correct?
Do you have this issue only with MeshStandardMaterial and MeshPhysicalMaterial or also with other materials.
Unfortunately, I don’t have an iOS device at hand so I’m able to verify this issue. In any event, your last post did not answer by question^^. So please test all “variation” examples and note what materials produce the mentioned warning. In this way, it’s hopefully possible to isolate the issue a bit.
About the first link that I’ve shared here, I’m uploading a hotfix to my production environment (ignoring the plane parameter) so the issue may not show there anymore.
In this link you can still see the issue live on iOS devices.