ORBI RBK53 (AC3000) "No AirPrint Printers Found" After Firmware V2.1.4.10 Installed

I have been running the 2.1.4.10 firmware since last week. Network scan via "Net Analyser" iOS app showed NO Bonjour flags present

I have performed the following additional toubleshooting from my iMac (which is fairly distant from my Comcast/ORBI gateways):

1. Connect ONLY via my Comcast Wifi Modem:
   1. Powered off ALL ORBI units:
   2. Turned on WiFi on my Comcast Router
   3. Logged in to my Comcast WiFi
   4. Weak signal & slow upload/download speeds
   5. mDNS/Bonjour/AirPrint was rock solid
   6. Network scan via "Net Analyser" iOS app shows Bonjour flags are present
2. Connect ONLY via ORBI RBK53:
   1. Turned off WiFi on my Comcast Router
   2. Powered on ORBI RBR50 Router
      1. Logged into ORBI WiFi 
      2. Better signal & faster (but not max) upload/download speeds
      3. mDNS/Bonjour/AirPrint working. Network scan via "Net Analyser" iOS app shows:
         1. macOS & iOS seem to reliantly report Bonjour as present
         2. AirPrint printers (HP & Brother) sometimes don't report Bonjour as present
      4. Waited
   3. Powered on ORBI RBS50 Satelite closest to my iMac
      1. Max signal & max upload/download speeds
      2. mDNS/Bonjour/AirPrint working
      3. Waited
   4. Powered on final ORBI RBS50 Satelite
      
      1. Everything working
      2. Waited

While mDNS/Bonjour/AirPrint is still sometimes glitchy. It is working under the 2.1.4.10 firmware after starting the router & satellites in slow sequence.