It was the same for me with the 12.5.5. After a day I suddenly had gpay and safetynet also confirmed with "passed". So wait a little longer. No problem.
I just installed twrp on my Mi 11 Ultra via fastboot. Previously the version xiaomi EU 12.5.7 stable copied into the donload folder of the phone and installed from there selected via TWRP. So far everything without any problem. But: Safetynet reports errors. Before, with the Xiaomi 12.5.5. it...
Just flashed the Mi 11 ultra 12/512 CN from 12.5.2 chinese stable to the new xiaomi.eu 12.5.5 stable rom. without any problem. All google services work fine. The Ultra arrived exactly a week ago. Unlock bootloader requested, and today, i.e. after 7 days, unlocked and immediately afterwards...