[continuation of wifi problems on Bookworm]

In tinkering with a usb-wifi dongle on a Pi5 running Bookworm
it appears that adding or removing the usb-wifi dongle changes
device names in a surprising way:

When booted with no dongle, the internal wifi is wlan0, as expected.
When booted with the dongle, the internal wifi is wlan1 and the dongle
is wlan0, a surprise.

I expected that devices would be given enumeration in order of discovery.

Is this behavior normal?

If you don't want that; run raspi-config and select predictable names in networking. Each interface will then have a consistent and unique name.