Hey friend,Are you talking about Vanced or ReVanced?
I'm not using WhatsApp but when I click on a video in Telegram I get a selection where I want to open it, browser or ReVanced Extended.
Click remember for ReVanced.
I have the same issue. I installed revanced through patching with root, with 0.53 manager. Videos in WhatsApp open in its internal player ( no prompt to choose app) also previews in Gplay don't start (could be an adaway block?) And library's history only fills up when watching a vid from the browser.
In Youtube OpenByDefault tab only 5 links show up.