While we wait for an official fix, I’ve put together a small macOS helper. It checks DisplayLinkPrivilegedHelper’s memory usage every 15 minutes and restarts that helper if it reaches 750 MiB. No Mac reboot is needed. It hasn’t interrupted my displays, but other setups may briefly disconnect. Setup requires administrator authentication.
Source code and instructions:
https://github.com/Florian-Cullmann/displaylink-guard
Hope this helps!