OpenStreetMap
I can´t reproduce your error at this position, but it sounds like a error that can happen if you haven´t downloaded the whole multipolygon relation in iD-Editor. Then it´s only on your client, and you can fix it if you select the residential landuse relation and click the download icon for all parts.
Most times this error happens if there is a big Landuse Multipolygon with mutiples of members, but it can also happen in these smaller ones like here.
I can´t find a mapping error here, but maybe you could link to the park where the error occured, because there isn´t any park near the note´s position. The only inner member i can find here is a "landuse=allotments" (in germany we call them "Kleingarten", so thats what you could find on a sign, maybe they got something with "park" in their name, they can choose them freely).
