I had to re-tighten the nut, but its been ok since - and I find I’m less prone to drop the bottom tube while unfolding now the movement is stiffer. I noticed when folded the bottom tube has to deviate more from a simple up and down fold to move out and over the rear tube and the tube protector.
On my old strida 2.5 the tube didn’t seem to have to move so much to the right to get over the ‘nobble’ on the plastic bottom bracket housing (and sometime I didn’t even bother doing that)