It won’t let me edit my post again, but there’s another update.
So it seems it’s not my sys-whonix, but rather anon-whonix. I tried another Workstation and the Tails img downloaded perfectly fine.
The only change I’ve made recently is I cloned a new anon-whonix appVM from the Workstation Template, and I paired it with sys-whonix, but I don’t know where I could have gone wrong