Tempo change and midi in Ardour 7.3

Hi
I’m using Ardour 7.3
I wrote 2 bars of 1/4 notes using the step entry keyboard.
Then i changed the tempo from the default 120 to 100bpm
Now the region is shorter than 2 bars
Is this the correct behaviour? I thought v7 made midi regions follow tempo changes, or did I misunderstand?