Been there, seen it, done it.
I was going from Prague to Croatia at the time. Breathtakingly beautiful, great roads and even the petrol station staff spoke perfect English. As I was coming from Graz in Austria, heading for Porec on the Istrian peninsula in Croatia and passed through Ljubljana on the way, I reckon I drove across most of it! No problems at all and I reckon your associate must have been thinking of somewhere else.
Even if there were a problem, if you are coming from Italy you are not going to be in it for long enough to notice. That bit of the E61 from the Italian border outside Trieste to Croatia is all of 25km....
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