Problem in moving from blender 4.0 to 4.2.1

i have a problem, when i upgraded to blender 4.2.1 LTS and opened my project i got these weird pattern (i deleted the purple texture myself its not part of the problem) and the patterns disapear when i move from EVEE to cycles

I never encountered that. But EEVEE-Next is only tested since few months.
4.2 is first release using EEVEE-Next.

There may be a platform incompatibility, not reported.
https://developer.blender.org/docs/release_notes/4.2/eevee/#platform-compatibility

It looks like a troubled reflection. It could be result of weird combination of settings. But we can not guess, if it is related to light settings, shader settings or global Ray Tracing settings.

Investigate, if you can reproduce it with simplest .blend file possible.
Then, share it in bugtracker.

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Thank u for supporting my friend