Why this behaviour in the Sample Editor Slice action?

[XLColdJ]

After you apply Slices to the event, it becomes an audio part.

Audio Part Editor - Cubase Pro - 15.0

As @Buer said in another thread:

Strange crashy behaviour when using Create Slices in Hitpoint section

I can confirm the behaviour you describe, except for the fact that I wouldn’t call it to *re-open’ when I click the event in project window; it opens in ‘the part editor’. I think that this is the normal behavior. You open the event in sample editor by clicking the event in the project window. you creating hitpoints in the sample, and select create ‘slices’, which convert the event to slices in a part. when you do this there’s no more events to display in the sample editor, so it goes black, …

You can covert those slices into events if you want to use the sample editor.