so did a couple of games in classic where somehow a bastion could be in turret form while moving around lol…
unless if i remember that was a thing or something. its been so long that i forgot
edit: forgot that was his ultimate but i swore he was shooting machine gun as well hmm. actually watching the replay i saw that he wasnt in turret form but it glitched that it made him shoot like in robot form in turret form or something. maybe a skin glitch
around 4:25 in replay - 3AEFK8
As you said yourself, this is just an animation bug, but it’s still confusing.
But another question—was there a hotfix? Yesterday, Sombra’s Translocator couldn’t be destroyed, but today it suddenly works. That would be extremely strange, considering other, more problematic bugs are just being ignored!
yea it can be destroyed now, noticed it earlier today. the first day of this classic tho it as invincible. guess that last patch or a hotfix?
Apparently its a graphical glitch: Was it a Classic Bastion glitch? - #17 by Electro71-1835
Still unsure if it existed back in the Classic OW1 days 
Finally Blizzard got the most critical bug. Maybe with this reason they also will pay attention to other classic Bastion’s bugs. Like turret tower while Bastion in air in tank form. Turret’s crit hitbox is active, but tank form never had any crit one.
Also the bug with resource indicator in classic. Resource meter works normal in perk repair, but in classic ut just dissappear after unpressing repair button. Indicator should stay in screen until it gain to full like in perk repair.
Also crouching in tank form. Tank never was able to crouch, but in classic it do.
Also the strange visual bug configuring to turret using repair before, shows tank form first view and quickly replaces to turret one.
And sleep. After awaking up Bastion turn to recon form, but for 0.5 seconds game shows turret view, like you in turret, but you actually in recon. I pressed shift many times thinking that I’m in turret and died many times.
I know Blizzard, even after our tons of requests you will not return tank, but please, at least fix tank and other bugs to allow enjoy us this in this rare limited mode