I could not reproduce this. I tried: - alarm in 1 minute - default sound - snooze 8 minutes - used "Run rule's actions" - disabled from clock application - changed the time to couple minutes later - saved No crash.
I'm not sure I understand. Was a "not" missing in that sentence? Because I just noticed that in the new version, even after pressing "Stop" the alarm is not deleted from clock application. It just becomes inactive. I think in the previous version it was really deleted. This is not a huge thing for me personally, as activating the alarm again does not create a new entry but instead the old one is reused. But this definitely requires some testing, as I worry a bit that in some scenarios the alarm might be duplicated (ie. many entries with same title in clock application) which would not be nice.
Yes... missing "sound" attribute caused the alarm to be undisablable (not sure that's a word either). It's unfortunate that it doesn't use the default now, but I think this is the lesser of two evils. One can always explicitly define the alarm sound.