FYI for anyone reading;
Scaling is the issue. A hotfix will be released within the next few days. Until then, if possible, set Windows scaling to 100%! :)
Scaling hotfix is now out!
https://godnoken.itch.io/gametranslate/devlog/949651/update-041-text-capture-fix...
However, there are two caveats;
- Font scaling is out of whack when Windows is scaled up.
- Tesseract seems unusable when using a large scaling value.
These will be fixed in the next update.
Massive thank you to @Sandow for helping me debug this!