Third-party apps notifications not vibrating on Apple Watch

Hello,

I've had a problem with notifications on my Apple Watch since I got it, but I can't figure out if it's just a normal limitation, a bug, or a setting I've forgotten or misconfigured. I have an Apple Watch Series 11 GPS and an iPhone 15, and both are running the latest versions of watchOS and iOS.

The problem is that notifications only vibrate on my wrist for native Apple apps (Calendar, Messages, etc.), but not for third-party apps (Messenger, WhatsApp and 2-3 other apps which notifications I'd like to vibrate). I receive them, they appear on the watch, but they don't vibrate. In the Watch app on my iPhone, for notifications from non-Apple apps, there's only a "Mirroring from iPhone" toggle, so I can't customize notifications settings for those apps, unlike with Apple apps notifications settings. I feel like I've checked every possible setting (on both the iPhone and the Apple Watch), and my online researchs haven't helped me figuring out if it's normal, a bug, or if I've misconfigured something. On the other hand, sounds notifications are working for both Apple and non-Apple apps.

Does anyone know the cause or solution to this? If it's "normal", is there an alternative way (e.g. an app, a shortcut, or a procedure) to "force" vibrations for third-party apps notifications on the watch?

Thanks in advance to anyone who reads and answers this post. ^^