The realtek device probes first and iwd sees this as phy0 and the internal Broadcom chip as phy1
Then I see Jun 26 09:44:20 KODI-Kitchen iwd[382]: NEW_INTERFACE failed: Too many open files in system
After this point I only see ConnMan mentioning wlan0 which has the MAC address of the Broadcom chip. The "Too many open files in system" failure is unusual and normally indicates an internal bug that results in a process leaking file handles; then at some point the OS hits the 'ulimit' value (in LE, this is 1024).
The first thing I would do is bump up to an LE13 nightly which has newer everything to see if that magically fixes some underlying issue in drivers or iwd or connman. If that doesn't fix it, then this should raise the 'open files' ulimit:
Then reboot and see if that changes anything? (if no, share a log again).