Unfortunately this seems to be something that Apple really needs to work with DisplayLink on, it's not DL's fault that Apple heavily changed the graphics subsystem and doesn't have a way for DL to work around. For now, I'm just using the Airplay mirroring trick to have it mirror my MBP's internal display, and have the display mostly closed. It means I can't really use the internal screen as a work display, but I generally don't anyways.
Thank you for posting the downgrade image, I'll download it in case I really need to go back.
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