I've found a bug in the web interface for the DVR server. No idea how long it's been there since I've only recently done this action, but I am on the latest pre-release as of about 10 mins ago. The bug is repeatable for me:
- go to Library > TV Shows
- click on the tile for one of the shows
- click the red 'Trash' button in the 'Manage' tab on the right hand side of the show page
- click OK in the modal confirmation box 'Are you sure you want to put ALL the recordings in the trash?'
- nothing happens
- repeat steps 3 and 4
- all recordings for the show correctly deleted -> "No recordings found for show."