I just briefly looked at Mapillary sequences in that area, but it seems that there is indeed a temporary link, so vehicles from this direction:  https://www.openstreetmap.org/way/1180409529#map=19/44.29481/20.02267

could enter trunk and proceed driving on to the east.

Here are the links where it can be barely seen:
https://www.mapillary.com/app/?pKey=1462551251342416&lat=44.2946037552&lng=20.02342938879997&z=17.602111338777746&x=0.5895944224129847&y=0.556140320225853&zoom=1.823450134770889&focus=photo

https://www.mapillary.com/app/?pKey=977807290304140&lat=44.29444779999798&lng=20.02359430000206&z=17.039694139704856&focus=photo