I had similar issue with the Dell D6000 Displaylink.
My Dell D6000 stopped charging my MacBook after I had updated to Catalina 10.15.4. I also started having the black screen while streaming Netflix on Safari.
I found the fix on Reddit and it worked for me. See the thread
here. The fix is to use a PC to update the D6000's firmware to ver
A03.
I hope this works for you all!