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And LG are sending a couple of sets of new USBC/Thunderbolt cables to see if this fixes the issue.
Ouch. The TB/USBC cable supplied with my LG 34WK95U wasn't very good either, it worked only with direct connection to the Macbook and not daisy chained with the CalDigit. (it probably had its reasons... maybe there wasn't sufficient bandwidth left to carry both data + display after the dock)
I happened to have a 4k/144 (DP 1.4) USBC to DisplayPort cable at hand, ready to be returned, but when I tried it worked very well. Had to forego "single cable input" to the display as I also had to run the USB cable to it (but it all connects to the docking station anyway) and put the supplied (and flimsy) LG cable where it belonged, in its box.
disq
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.