Fenix 5 (fw 9.20) crash during triathlon activity

On sunday I was doing the Ironman nice and when entering t2 I pressed laps and the watch started to wait for a bit of time until I pressed lap again and then it get me to run and finish race, i though okay no problem i'lll just save it and start a normal run for the marathon, but Saving took forever (as long my t2 was taking for like 7mn) and I started to reboot it, when rebooted it took me to the Run field which I tried to discard and then it looped forever with no option to reset until the battery drained and after that back at home it could connect. Needless to say I was very pissed off to not be able to pace my marathon for my A race.

Here is my corrupted FIT file (or i belive it is) or it means it's lost forever :

https://drive.google.com/a/chmouel.com/uc?id=1_O8DaO7JYLU3im1-bJlddKp8PT02lXhM&export=download