Steps to reproduce:
- Create a sysfolder with categories.
- Create categories
- Translate sysfolder
- Translate a category
- Edit the translated category
Only the default language categories are shown.
The same behavior happens if you create the default Text & Images element of Fluid-Styled-Content.
Another strange behavior seems that the english translation didn´t respect the german main node selection.
I tried this in 2 different installations.
TYPO3 version 12.4.17.
Screenshots: