According to osm.wiki/DE:How_to_map_a#Fu.C3.9Fweg (sorry, this info is not on the english version) a sidewalk that is right next to a road, where you can step on the road at any time shouldn't be mapped separately, but instead the road should get sidewalk=left/right/both.

And on the southern edge of the park there's no sidewalk, just the other path that is still there.
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Published using OSMCha: https://osmcha.org/changesets/106885530