I have an RB912UAG-5HPnD with an Sierra MC7455 with all USB3 pins taped out, it is working fine in MBIM and PPP in v7.1rc1-4.
I am trying to investigate an issue with v7.1 and the modem getting stuck by checking if this issue happens in v6, I downgraded to v6.48.4 (also tried long term 6.47 and dev 6.49rc) but in all v6 versions I have a problem where the usb1 port is shown as invalid and having 4 channels: I have some devices in the field using RBM33G and MC7455 running 6.44.2 where it shows 2 channels and they are working just fine.
I also tried playing with the "Ignore DirectIP Modem" setting but it didn't help either.
I also checked the AT!USBCOMP in both rotuers and it is the same 1,1,50D:
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# oct/04/2021 19:29:31 by RouterOS 6.48.4 # software id = 466L-1LBS # # model = 912UAG-5HPnD # serial number = A2860BC9FAA1 /interface bridge add admin-mac=C4:AD:34:68:9F:F6 auto-mac=no comment=defconf name=bridge /interface wireless set [ find default-name=wlan1 ] band=5ghz-a/n channel-width=20/40mhz-XX disabled=no frequency=auto installation=outdoor mode=ap-bridge ssid=MikroTik-689FF7 /interface wireless security-profiles set [ find default=yes ] supplicant-identity=MikroTik /port set 0 name=usb1 /interface ppp-client add apn=internet dial-command="AT+CGATT=1;D*99#" dial-on-demand=no modem-init="AT+CGATT=0" name=ppp-out1 port=usb1 /interface bridge port add bridge=bridge comment=defconf interface=ether1 add bridge=bridge comment=defconf interface=wlan1 /ip dhcp-client add comment=defconf disabled=no interface=bridge /port firmware set ignore-directip-modem=yes /system clock set time-zone-name=Asia/Jerusalem