Kernel panic when plugging in Sonnet eGFX / Sapphire RX580
I just got an RX580 in a Sonnet eGFX enclosure. When I plug it in to either a 2019 13" MBP (15,2) on Catalina or a 2015 13" MBP (12,1) on Mojave with a TB2->TB3 adapter the computers experience kernel panics. I tried using PurgeWrangler, to no effect, as well as NVRAM and SMC resets.
Any ideas for next steps?
I tried putting the RX580 into a BizonBox 2 and had the same behavior, which leads me to think the problem is with the video card rather than the enclosure. Looking into the kernel logs, I see a bunch of chatter about a Radeon X4000 driver, which matches: