Unfortunately when I checked, I couldn’t find it in my files. I am pretty confident there was another page that I found the image on, and it wasn’t the Tapatalk thread that can be seen when reverse searching.
Regardless, I don’t remember seeing any additional photos, just a line drawing depiction of the vehicle in full.
Although, when I do a reverse image search I can find a page that claims this vehicle to be a Panzer II Ausf. G armed with a 7.5cm PaK 40, not a 5cm.
Personally, I think that a cast turret Beute T-34/76 with the German cupola and schurzen would be a pretty neat battle pass reward, but still not one that would be very frustrating to miss.
The concept reminds me a bit of the Israeli M4A2 “Meir”. Unfortunately, however, the poster could not help me with a source, so not sure what references there are for this vehicle.
From this Reddit post, but I don’t think it’s referring to the T-34 in the photo.
I have not yet come across such, but it could have very well been made. Conciddering that there was the Flakpanzer I Ausf.A, 3,7 cm Flak auf Panzer I Ausf.B, Bergepanzer 38(t) 2 cm Flak, Panzer III 2 cm Flak. So putting a 2 cm Flak on a Panzer II chassis is no problem.