'"Window" is not responding' dialog does stay when triggering program is already closed

### What Happened?

I closed Chrome, because it was hanging. The "not responding" dialogs stayed.

### Steps to Reproduce

0. have a hanging program (maybe you can create a demo for that)
1. get "program is hanging" dialog
2. close program
3. the "hanging" dialog stays

### Expected Behavior

i think the dialogs should disappear, because the hanging situation is resolved. and most of the time that happens, but not always

when i use the "force quit" button from the dialog, all dialogs dissappear (https://youtu.be/WkmW4PAtCI8?t=482)

here they stay: https://youtu.be/WkmW4PAtCI8?t=667 (also gala crashes in the background https://github.com/elementary/gala/issues/1449)

### OS Version

Other Linux

NixOS 22.05.2397.5c211b47aea

### Software Version

Latest release (I have run all updates)

gala-6.3.1

### Log Output

_No response_

### Hardware Info

- Intel i9-9900K processor with 3.6GHz
- G.Skill Ripjaws 32 GB DDR4 RAM (3200 MHz)
- Samsung 970 EVO Plus 1TB NVMe M.2 SSD
- AMD Radeon RX 6600 XT graphics card with 8 GB VRAM
- Gigabyte Z390 UD motherboard
- Noctua NH-D15 cooler
- be quiet! Straight Power 11 650 Watt power supply unit
- Antec One Midi Tower case