Alarm only plays through earphones on iPhone 16, even when not worn with iOS 26

I sleep with earphones and noticed that after updating to iOS26, the alarm sound only comes through the earphones which is quite a problem as if I take them out during the night, but let them plugged into the phone (usb-c) or I just simply lose them when rolling from one side to the other, then I will not hear the alarm at all.

I tested with multiple earphones, tried with bluetooth and wired as well, it always only comes through them, not the phone speakers.

Is there a solution for this? I suspect it is not an intended feature.

(I have an iPhone 16.)

[Re-Titled by Moderator]

Original Title: iOS26 - alarm only sounds through earphones