What i did / Steps to reproduce

1. Visit bluemap URL
2. take screenshot in free-flight/spectator mode using hamburger menu option
3. Recieve upside-down screenshot

Expected result

Actual result

Context

BlueMap Version:
Version: 3.20-21
Commit: 2dd7a0a
Implementation: forge-1.20
Minecraft compatibility: 1.20.1 (1.20.0)
Render-threads: 1
Available processors: 4
Available memory: 8192 MiB

It wouldn't render the screenshot in the original message for some reason...

I can't reproduce this issue, my screenshots are facing the right way.
Which browser are you using? Is your webapp up-to-date?