I am having the same issue with my RX 5700 on 10.15.2. For what it's worth, I was able to boot into safe mode adding the -x flag at the Clover screen, but cannot get past the black screen without this flag. This doesn't solve the problem, but should help you get to your files.
UPDATE: adding...
I have the same card and am not sure that I am getting the best performance out of it in Yosemite. Did you ever get an answer or have success with it? Thanks.
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