Last week Vue updated to 3.3.5. This immediately broke a lot of things and a fix was created in 3.3.6.
However, the only thing still broken is vue-leaflet.

The following error is thrown at runtime:

Uncaught (in promise) Error: Map container not found.
    at NewClass._initContainer (leaflet-src.js:4205:1)
    at NewClass.initialize (leaflet-src.js:3249:1)
    at new NewClass (leaflet-src.js:302:1)
    at createMap (leaflet-src.js:4863:1)
    at eval (vue-leaflet.es.js:1363:1)

Checking in the development console I can find the map element, so my assumption is that somehow the creation of the leaflet map is called too early.

Reverting to [email protected] fixes the issue.