I don't remember exactly if my cable was on the motherboard or the GPU, I'd try both and if you do not use the 5700XT remove the "agdpmod=pikera" flag before booting.
Not really, I'm using Chrome right now with no issues at all. My RX 5700 is the XT variant, not sure if it makes any difference. In case this issue persists, the 10.15.2 must be in the next couple weeks and it will improve compatibility and stability with the RX series.
I had success with the same hardware and since the author of the post didn't upload the EFI folder, I'm uploading mine (with the required boot flags)
The only change I made before uploading was to generate new serial numbers to avoid duplications.
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