import audio tracks -- i don't get it


i import audio track from other procject.
When i do so the tracks appear with regions, plugs and automations. sends and routing are OK because my sessions have same names and setup.

but when i press play no sound is coming out of those tracks. no graphic visualisation on both EQ and levelout of the track makes me think it’s buged. i tried to reassign routing but nothing work except : i have to copy the region to another new created track" to hear the content.
anyone experience that ?

omg i get so many routing assign bug this is madness.
i’m writing automation with loops and sometime sound is passing to send to the right group but at one point everything stop. all parameters are set so that sound should pass but nothing goes through. i have to close restart nuendo to get the sound…