Screenshots of new modes and legacy. Version 2.3.3.122
Basically I use two virtual presense sensors that get change via a shared switch with homekit.
To replicate you can change home / away via devices, with new modes nothing happens, with legacy my presense of away or home enables or disables the alarm.
I did also try deleting mirgrated auto created mode and recreate manually no joy.
Did note this post which is using switches as opposed to virtual presence
