RDR2 Armored Coach Robbery Doors wont blow off

[Tyraidooi]

I am trying to do the Hector Strawberry #3 armored coach robbery.  I kill off all the guards and drivers.  I have tried placing dynamite on both sides and lighting it, placing it and shooting it, and throwing at it.  No matter what I do the doors dont come off for me to rob the coach.  What am I doing wrong to get the doors to come off of this coach??

[Tyraidooi]

Also have since tried firing Dynamite arrows at it also the doors stay on.  These are the strongest doors of all time and think it has to be a bug.

[Tyraidooi]

So after 4 sticks of Dynamite, 6 dynamite arrows the door was still on.  I threw 2 fire bottles at it and the door fell off.  Not sure what to make of that but if any one else runs into this, hope this helps.

[Taterman]

I tried it five times and it never worked so I give up on it. My wife did it a few days ago and the door blew open.

[kastle1592]

Use the regular dynamite, not the volatile dynamite.