MIDI stuck notes; only T1 and PAGE – Octatrack

Octatrack MKII 1.40B.
MIDI sequencer: In chromatic mode, pressing and holding trig 1 (the first trig, T1, note C3) while pressing PAGE (E3), then letting go of PAGE causes the first note (C3) to be stuck (and vice versa.)

Reproduce:

Press T1 (C3)

Ok.

Press PAGE (E3)

Fine.
Press and hold T1 and press PAGE, then let go of PAGE, then T1

C3 is stuck, as no note OFF message is sent, until pressing T1 again:

You can try the reverse of this (holding PAGE first, then T1) and the results will be the same, but E3 will be the stuck note.

Can someone verify this for me?