A roughness value caused reflection issue that need help with

Godot Version

4.6.2

Question

As the pic shows a strange display when metallic and roughness are adjusted to be extreme to perform a polished surface, once in 4.5 there was no problem but 4.6 some false reflections appears, i tried to change project RENDER values to see if it is a setup issue, but nothing help, i can not individually imagine what is going wrong so seeking help here! Thanks!

There is another clue: 4.5 doesn’t shows actual reflection contents only simulates mirror, but 4.6 could be able to display actual reflection contents, if yes, is there anyway to turn this reflection simulation off. could be accepted.