systemd automounts do not reset properly after TimeoutIdleSec automatic unmounts

## What Happened
Automount units whose associated mount units have been auto-unmounted with TimeoutIdleSec do not trigger the associated mount unit when the automount path is accessed again until the automount unit is completely restarted.

I wasn't sure where to report this problem so I decided to open an issue here in case someone else found the same problem and also to upstream (Ubuntu) since I suspect is where this needs to be fixed: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1943037

## Expected Behavior
Automount units whose associated mount units have been auto-unmounted with TimeoutIdleSec will trigger the associated mount unit when the automount path is accessed again

## Steps to Reproduce
1. Trigger any automount unit with TimeoutIdleSec= set
2- Wait for the idle time to occur and systemd to unmount the associated mount unit
3. Then try to access the automount location again.

### Logs
N/A

## Platform Information
elementary OS 6 Odin
systemd version: systemd/focal-updates,now 245.4-4ubuntu3.11