Not on my 13 mini w/ iOS 18.1, and I don’t remember WiFi ever staying on when enabling airplane mode.

Weird that it seems to be different for different people, though.

According to an help article by Apple [1], if you activate wifi or bluetooth during airplane mode, it will remember that and not disable those when you use airplane mode again. I was also surprised reading your comment as for my phone wifi and bluetooth stay on during airplane mode. I must've activated them once and then it just stayed like that ever since.

[1] https://support.apple.com/en-my/guide/iphone/iphb771143ee/io...