Devices that have had issues so far when WPA3 is enabled: iPhone SE 2 (ax), Oculus Quest (1, ac), Google Pixel 2 (ac). Issue is always corrected by a router restart, but WPA3 enabled seems to cause a random subset of devices to fail to connect after a day or two. The subset of devices with an issue doesn't seem to be stable, but I've not tested every client when the issue emerges.

If I disable WPA3 as shown in the above image, I don't have any issues. It would be nice to have the additional security, such as protection of management frames and forward secrecy, but it's satisfactory for home use. I thought that I would contribute by reporting my observations.

@Kevin_Z 

I have re-enabled the setting. When/if the issue recurs, I'll provide PCAP of the devices trying to join the network. 
 

If the issue does not recur within one week, I'll say it was not reproducible. 

@Kevin_Z 

Thank you very much for your help! Unfortunately, it looks like the issue could not be repeated. It may be that the condition no longer exists. 

@henfredemars Just bought a TP-LInk AX90 (AX6600)

THIS!

WPA3 clearly isn't implemented properly. my IPHONE 10 supports full  WPA3, but the router refuses the allow the connect/expires the lease without allowing renew. 

Once I put it on WPA2 (which i DONT want), things start to work. 

This is simple stuff that shouldn't be an issue with a super expensive router, which I'm about to send back...

@Austnaaron 

Hi! My issue did return after a few days. It looks like the DHCP server on the device might stop responding after a while for reasons unclear. I'm not sure if this is the same issue that you are having or even the same issue I had earlier. I captured network activity that seems to show this, and I'm working with a support person on their side to understand better what's going on. 
 

Again, not sure if current issue related or not to WPA3. 

@henfredemars 

I had similar problems with my AX11000. With WPA3 turned on, devices would initially connect and access the Internet without issue. But after some time (about a day or so and perhaps when the DHCP lease had expired), waking the device would show that the wifi was connected to the AX11000, but there would be no Internet access. (Other devices at the time would be fine, so this is not a system-wide router issue.)

Disabling and re-enabling wifi would take much longer to reconnect than usual (say 20-30s), and even then, sometimes fail. Eventually the Internet access would return.

What solved it was turning off WPA3 on the router and going back to WPA2.

The device with problems seemed to be only the newer ones with WPA3 capability.

Seeing that WPA3 was added to the AX11000 relatively recently at the last firmware update, I have to assume that the implementation is buggy.