No it doesn’t after the initial set. Outside the working temperature range the flex biopolymer is very mechanically stable, it’s not really plausible for it to be under compression or tension internally like glass or hard resins can be. Because it’s in sheets it is liable to get kinks at steep bend angles though, and it will kind of buckle. Because it’s so strong, the interior of the bend becomes under compression and the exterior of the bend becomes under tension, which helps naturally straighten it out. In the knife edge connective tissue is way stronger than the biopolymer on the side of the PCB with the hole though so if the install was very stressful you’re bound to get kinks.
Uh huh 
I don’t believe in P5, all edge is knife edge