During a hike along 674 I've noticed two marked trails branching off towards the north that are missing in OSM (in the general area of this marker).

One of these is signposted with:

Capitello dell'Orsa
Pian di Festa (1.30)

The other two signs at that fork are:

(towards the Ponte Tibetano)

Capitello d'Orsa
Maiga Orsa (0.15)
Sentiero CAI N° 674

(towards Brentino)

Capitello dell'Orsa
Molino di Brentino (1.30)
Sentiero CAI N° 674