Guild Wars 2

While doing FotM lv30 for daily, our group were rolled Cliffside as our second fractal. Everything was okay and normal/non-buggy until we got to the Chest Seal where some vet mobs randomly went invulnerable on the first several attacks (not sure if my teammates noticed, though I queried it in chat), but then after a small delay, they were attack-able. I brushed it off as a small glitch or something, and we continued on.

Trouble happened at the Left and Right Arm Seals. After we broke the Left Seal completely, we noticed the chanter there didn’t despawn (we left it there and moved on). When we went to break the Right Seal, we realised the shield bubble came up after one hit and that the seal on the other side had regened a bit, even though the seal was not physically there anymore. So we ran back to break it again.. it seemed to work but when we finally got both seals down, the door/gate wouldn’t open. We tried wiping, but the seals regened with no mob spawned so we couldn’t break the seals to progress.

We had to do a complete fractal reset :/

Attachment is of after wiping. Seals with full bars, and no mobs.

My party hit a similar bug. The arm seals didn’t regenerate, but the gate wouldn’t open.

1. Party member with hammer fell to his death and checkpointed, but the hammer didn’t checkpoint with him
2. Party members all jumped to their deaths to try and force hammer to reset. Upon all dying, no one except one person was allowed to checkpoint. We left the instance one at a time and were able to checkpoint after doing so. The instance owner could not leave the party (else the instance would be destroyed) so we had to go revive her.
3. We realized upon regrouping that we had two hammers! Something must have bugged out when we were unable to checkpoint to cause a second one to spawn.
4. Similar to what OP describes we destroyed the arm seals and one was still able to take damage after being destroyed. We gave it one hit and destroyed it, but the gate would not open and the arm seal event was stuck with both health bars at 0%. At this point, we gave up.