After update from 10.15.3 to 10.15.4 external displays doesn't work via docking station

LG 24UD58 connects to MacBook pro '13 2018 occasionnaly after about an hour of connection. "Option" button + Detect Displays in System Preferences seems not work at all. Error occured after update of 17 May 2020.

Not sure if it's been mentioned here already as I haven't been keeping up with the discussion, but I found a fix for my Dell D6000 docking station. I read several people early on saying updating the dock's firmware might help but requires a Windows PC. I had an old Windows desktop I rarely use anymore so I hooked it up and was able to update with the D6000 Firmware Update Utility (https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=jw5xm) in about 20 minutes. Plugged it back up to my Air running 10.15.4 and it immediately recognized my two Dell monitors and is charging the MacBook like normal. It's only been 30 minutes or so, but so far so good.

Before all this, I did download DisplayLink Manager which didn't solve any issues at the time. When I hooked the dock back up to my Air, the DisplayLink Manager needed permission for screen recording, which I granted. Not sure if this is a necessary step, but there is a note on the right side of the download page (https://www.displaylink.com/downloads/macos) talking about MacOS 10.15 issues with a link to some more info on how to unblock DisplayLink Kernel Extensions.

Thought this might help some with the same dock as it was an easy fix for me, and the DisplayLink Kernel Extension information might help others even if they aren't using a D6000 dock.

I have a support case with a senior applecare advisor open since May 2. Got a response yesterday...

"I have a request from the same engineer I spoke with last time. I haven't heard anything yet but I’ll reach out again tonight."

No fix, no idea. I would say just wait to upgrade since 10.15.5 also does a Bridge OS firmware update that might break something else specifically to you.

I was having this issue this morning, I called apple support and they instructed that I do a SMC (system management chip) reset. everything works fine now, I hope you get this issue resolved.

After the upgrading of my MacBook Pro (15-inch, 2018), my BenQ EX3203R had no image at first now, after resetting SMC, the monitor stopped working at 144 Hz mode, only 59.88 Hz.

Thank you Apple

BTW: Apple sells Belkin and CalDigit docks.

Thank you very much! That is finally a single working solution. I was playing with EDID and got it working in DP1.2 mode but still in 30hz, this solution brings 60hz. Thank you.

Nope, I have an apple Cinema and it also has the problem. Arg!!

Had the same issue with the most recent upgrade to MacOS Catalina 10.15.6. I guess I have to just wait until they figure it out again?

Someone posted about updating the DisplayLink drivers and manager. That did the trick. All the other fancy stuff that people tried on my MacBook didn't do anything to help.