iOS 9.3.0: no sound from network MIDI session (worked in 9.2.5)

Since updating Pianoteq for iOS from 9.2.5 to 9.3.0, MIDI sent from a Mac
over a network MIDI session no longer makes any sound.

- 9.3.0, MIDI from a Mac over a network session: no sound
- 9.3.0, keyboard connected directly to the iPad: works
- 9.3.0, on-screen keyboard: works
- 9.2.5, same network setup: worked
- Pianoteq 8, same network setup: works

Setup: iPad Pro M1 12.9 on iPadOS 27.2. Tried from a Mac mini on macOS 27.2
and a MacBook on macOS 15.8.1, with the same result. Audio MIDI Setup shows
the session connected with the iPad as a participant, and the network session
is enabled as a MIDI input in Pianoteq.

The Mac seems fine: the same notes play over Bluetooth to a piano, and Pianoteq 8
receives them over the network session. Sending with or without timestamps
makes no difference.

Is anyone else seeing this on 9.3.0, or is there a new setting I missed?
I've also emailed support and will post anything I hear back.