Yep
We did various revisions to ground-combat and orbital-bombardment fairly soon before release. Mainly to address planets holding out too long. It's possible we missed something then, or introduced it.
Just ran a logging test and... well, none of the orbiting fleets is even calling DoOneDayOfGroundAttackAgainst(). That would be kind of a problem
Of course, they're not _supposed_ to call it for the first X days of being in orbit (to avoid planets flipping before you get a chance to see and react; during this preliminary time they can still attack the defending fleets if any), but I ran it for considerably longer than that window.
My next guess is that the fleets are frequently breaking off the attack and then resuming it, resetting that "don't actually attack the planet for X days" thing over and over again.
Another thing I found is that the Burlust planet in question has 10 bomb shelters, and I suspected that the 10% bonus vs bombing was adding up to a 100% shutdown, but I checked the math actually it wasn't adding up that way at all. Should be a fairly minor factor here.
Anyway, back to it.