Hospitality: Changing to prisoner beds destroys beds

[OrionFive]

In a room with 6 guest beds, if I select a bed, make it non-guest (colonist only)
and then set it to prisoner, most of the other beds straight up disappear, maybe one or two remains and gets converted to prisoner beds. Here is the exception detail:
[https://pastebin.com/bDeGYYNS]