Haswell GA-Z97MX-Gaming-5 Shutdown & Sleep Issues

I have installed Big Sur 11.2.3 on a i7-4790K in a GA-Z97MX-Gaming-5 with a Fenvi-T919 (connected to an internal USB header to enable bluetooth) using OpenCore 0.7.9.

All works as it should, however I am getting sleep (instant wake from sleep) and shutdown (automatic restart after shutdown) issues.

As I am still running 11.2.3, I have built a custom USB KeyMap GA-Z97MX-Gaming-5-USB.kext with the internal USB header set as type 255, however sleep and shutdown still doesn't work...

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Author: milmber