We're happy to announce that the fix for this issue is now available in the latest update of InDesign - version 17.2 that is available from Creative Cloud Desktop application.
Please update to this latest version to get the fix.
Adobe InDesign team
An error occurred while saving the commentAshley Prine commented
This is very troublesome for me too. Also I find it inconsistent, sometimes the soft return + space =2 spaces, some times it is only one space ( like it should be the soft return should not translate not a space)- This difference can happen within the same chapter and when this happens I have to abandon this function all together and use old fashioned section starts.