I’ve replicated this on other computers. Upon upgrading or installing fresh, I create a new OPC-UA device (or will have already had the same device created in the case of an upgrade), this device is SLC and has an IP address and connection path. Other than those items, defaults were left. This device will remain trying to connect (determining protocol).
This problem did not exist in the previous two versions.
Also, possibly related, PLC5 devices intermittently lose address ranges, which causes problems with project that relying on them.