@leocg a co-worker also tested it and got no issues whatsoever. Considering I found the issue in Opera GX, I guess I'll open a new thread in the right forum. I wonder if it might be related to some OS issue or something like that.

Hey there, i'd like to confirm this issue is actually happening.
It's usually not showing up, and after a few tries (move mouse out of tab and over it again) it eventually shows up a rectangle with the text, which also behaves in a weird way since it doesn't show all the text.

Opera version: LVL2 (core: 71.0.3770.456)
Public link I used to reproduce the error: https://stackoverflow.com/questions/24797485/how-to-download-image-from-url
Using Windows 10 Home, version 20H2

Let me know if there's any further info I can provide.