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Look under System -> Library -> Displays -> Contents -> Resources -> Overrides -> DisplayVendorID-10ac. Is there a file named DisplayProductID-4147 and DisplayProduct-4147.mtdd? Before trying the next step back up both files (if present) and delete the DisplayProductID-4147 file and then...

Still running Mojave (10.14.6) and I had an 24" Apple Cinema Display connected as well.

I tried the included file but it would just turn the display on and off like you experienced on the Acer. It also did the same for other connected displays, so I had to boot into recovery mode to delete the file again.

Yeah, I opened the UP2715K mtdd but I couldn't really get anything out of the data blob it provided. How would I go about making a 8K mtdd file?

So would the next logical step be to install Catalina and see if it acts any different?

I'll grab pictures of it later tonight or tomorrow. I'm running Mojave right now but plan on putting another SSD in the system to boot Catalina. This is on a Mac Pro (5,1) though. Also I didn't remove the override file. I'll try that too. UPDATE: Removed the override file and now it runs at...

Here is the output. With the mtdd file for the UP2715K the display shows up as a single display (instead of two) but the 5120 x 2880 resolution is stretched over the two DP inputs (so you have to switch input to see the other half).