Window Filter doesn't recognize Firefox until focused

[glenreesor]

Mac: Mac Mini
macOS: Ventura 13.4.1
Hammerspoon: 0.9.100 (6815)

It looks like hs.window.filter doesn't recognize Firefox when it is initially opened. However if you focus another window and then focus Firefox, then a hs.window.filter.windowCreated event will get triggered.

Here's some code to demonstrate:
init.txt

Here's a video using the code above. Everything is super slow because this is an old Mac Mini running through a VNC connection 😄 . Clicks are represented by the big red circles.

No.event.for.Firefox.mp4

Similar behavior occurs for LibreOffice. Interestingly, calling hs.window.allWindows() is another way to trigger recognizing Firefox and LibreOffice.

Edit: I just realized that this also occurs for other apps, like System Settings. Presumably there are others.