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Have you got this sorted yet? Those Ultrafine monitors are odd (but awesome) beasts.
I have had zero issues with mine but when I sold it (on here) the chap who bought it could not get it to work at all, he brought it back and we tried everything and nothing worked, think he had a one year newer MacBook than my main one.
Since then I have used it with a 2016 MBP, 2017 MBP, 2018 Mac mini and a Dual boot hackintosh with TB3 and it was fine with all, but the guy who bought it from me had no luck.
You are talking the Apple sanctioned ones right?
chrisbmx116-
The screen issue is sort of fixed. Went from one problem to another. To cut a long story short, I already had a monitor which I was using with an Apple TV through HDMI, this was an LG-27qn880 and then I got another monitor the LG UltraFine 32UN880 to replace that and use the smaller one as a WFH setup. But, neither monitor would work happily with the MacBook Pro's (2016 & 2020) or the iPad Pro's. The 32" monitor would charge everything, but wouldn't display anything.
After a hour on the phone with Apple, and a further hour on the phone with LG trying a combination of all the devices and supplied cables, it transpires that the USBC port on the 27" monitor is faulty and is off for warranty repair, and the cables LG supplied with both monitors don't work with Apple devices. I ended up getting a Thunderbolt 4 cable which works perfectly with the 32" monitor, it charges and displays perfectly, despite displaying a warning message that it's not LG compliant.
And LG are sending a couple of sets of new USBC/Thunderbolt cables to see if this fixes the issue.
Muppetteer
I am finding this out the hard way. It works fine with USC-C to HDMI, but then I have to have a separate cable for charging, and the whole point of spending this much was to have a one cable solution.