A wrong Life Stage can not be edited directly. So this is how to work around:
This lizard observation was classified as a juvenile, while it clearly shows eggs. This is how it looked before correction:
To correct this, I identified the observation as a plant, thereby pushing the ID to “State of matter Life”. Then I edited and deleted the plant ID, so the ID was lizard again.
The wrong Life Stage information was lost in this process and the right Life Stage could be subsequently chosen.
Now after correction: https://www.inaturalist.org/observations/3684332