That’s what I thought. I am using Stage Traxx 3 as well. Here’s a bit more details about the issue:
I purchased the CQ20-B a couple of months ago and was able to get the firewire-to-usb connection working most of the time (in multitrack mode @ 48kHz). The connection has however been a bit flaky lately (I sometimes needed to disconnect and reconnect the cable), but it is now completely broken. I tried several different iPads and none of them are able to see the mixer outputs. I also tried another brand new lightning to USB-B cable without success. If I connect another audio interface (a Yamaha EAD-10) to my iPad using the same cable, the iPad automatically sees it. The problem only seems to arise with the CQ-20B.
My iPad is running the latest iOS release 17.6.1 and my CQ-20B has the latest firmware (1.2.1).