Well considering I have personally observed this unit behaviour for a considerable time prior to the glory update now I'm pretty sure it's a persistent issue in the game.
Also just had a battle that reminded me of another condition and that is ambush traps right next to walls allowing the infantry to shoot through the walls. This is easily explained by the fact that the detection radius of the trap extends beyond the wall and new ambush troops think that there is no obstacle between them and the unit that sets the trap off.
aoe.kaskusempire what happens in the video is essentially the same as the ambush trap bug. The heavy tank spawns from the destroyed factory while the artillery are within its detection radius so it thinks there is no obstacle.
Yes this is a bad bug but it isn't a new one at all, it purely depends on the base layout and approach direction so it is a lot more uncommon than others. Hopefully it gets fixed in the next round of patches.