I would love to know why is my bet lost.

According to your rules my bet 19316143389 is not lost. The 3rd map went to overtime so it should be voided because it isn't REGULAR TIME. My bet had no overtime option as you can see here the very same market.
https://i.imgur.com/oNzW1EG.png
Account ID: 281401027
Bet ID: 19316143389


Also, I was told by chat support that in overtime 3rd map cases, all bets on regular time are voided:
https://i.imgur.com/8pJNhP3.png

I contacted support and they didnt restore my bet yet!