Second Monitor not Working, 10.13 PB3 RX 480

I have a completely working installation of 10.12.6 with 0 problems. I installed 10.13 PB 3 and it works well, but I cannot use my second display anymore. IORegistryExplorer doesn't even see the second display in 10.13, even with identical (Dayman) framebuffers to 10.12.6. I have tried searching for a while, but there aren't really any reliable sources out there for High Sierra, especially with hackintoshes.

I've tried booting without the display on, replugging, booting with no displays, booting with CSM on/off with iGPU as primary/secondary, and changing the framebuffers. There are reports of regular macs having trouble with external monitors, so it may just be a kink in the OS for now, but has anyone else been experiencing this issue?

Build:

GA-Z170X-UD3

6600K

RX480, 8GB

submitted by /u/HNNNNNNNNGHH
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