So we have discovered an issue where the fire from incen ammo (bullets, arrows) is not causing damage to a base when the TC is present.
We first encountered this with Raidable Bases and thought it was an issue with that plugin, but in testing discovered that even player-built bases are an issue.
If there is a TC, then the fire does not damage boxes, bases, etc. If the TC is destroyed or not placed, then it works just fine.
I am assuming this is a base protection issue via War Mode, since we don't have any other plugin that would be preventing damage to bases or deployables.