My Xiaomi Mi 10T Lite locks itself when I'm gaming while being in a WhatsApp call

[Alwaysmi]

I've a Xiaomi Mi 10T Lite running Xiaomi.eu 21.6.16 Weekly ROM.
When I'm gaming while being in a WhatsApp call, my phone locks itself and goes black.
Turning off the proximity sensor hasn't fixed the issue.
It only stops when I game and talk on the same time on WhatsApp with headphones or earbuds plugged in.
My phone is running the latest Xiaomi.eu Weekly ROM.
Is this fixable or is this a bug of the ROM?
If it's fixable, how can I fix it?

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[Firealchemist]

Download the MIUI 12.5 from the official website and install it, it works for me