Mac OS 10.13.3, Xcode 9.3-beta3

1. Install IWDP with brew
2. Start iPhoneX 11.3 Simulator and open Safari in it
3. Start ios_webkit_debug_proxy in terminal

Actual result:
No devices are shown in the list

Expected device:
The simulator should be shown in the list.
On the same system with Xcode 9.2 the output is

Listing devices on :9221 Connected :9222 to SIMULATOR (SIMULATOR) 

It might be that Apple has deprecated debugging via TCP port in the recent Xcode SDK and it is only available via Unix socket (probably, because this is the only thing I can se in lsof output of launchd_sim process so far: /private/tmp/com.apple.launchd.r4UKA9gcsI/com.apple.webinspectord_sim.socket