I died after my boat got destroyed with 75% conditions.
since then to find my corpse I made more than 30+ jumps and it seems the damages varies between 0 and 50 max.
I'm 100% positive my boat was at 75 because by then I wasn't 100% sure max damage was 50 and I wa s a bit worried( I'm still not sure but it seems very likely)
What happened that triggers the bug imo is that I set swimming on just when I entered the vortex ( to save previous seconds if my boat was destroyed).