Bug: Mana stockpile won't burn

[SingularByte]

I'm having a strange issue in the Motherlode mission where I can burn the mana node fine, but the actual stockpile seems extremely inconsistent to burn; out of the three times I've played the level, it didn't set on fire twice and I had to just quit. Even when I have Rion stand directly adjacent to it multiple turns tanking fireballs and causing it to practically be ringed by a swathe of mildfire, it just refuses to burn. Is there some trick to it, or is it bugged?

[Shemetz]

I'm having this too now, I think it's bugged.

[Patroklos]

I had this too, I would suggest reporting it as a bug in game right after you foresee when it should burn but doesn't so they get good logs. I forgot to do that. I was able to get it to burn by moving the enemies around to a different spot.

[iwikal]

I had this too, kinda. First attempt it lit on fire just fine, but I rewound and tried to light it on fire a different way, and after that it just wouldn't happen, no matter what I did. Had to restart the level and then it worked.

[Derpykat5]

Yeah, I needed two tries to light the stockpile as well. Luckily it caught on the second attempt because I was running out of enemies...