Unable to answer "Does this bench have a backrest?" – Garden – osm.org/way/341308086 via StreetComplete 57.1:

bench does not exist

bike rack

via StreetComplete 57.1

Attached photo(s):
https://westnordost.de/p/207356.jpg

trash bin here

via StreetComplete 57.1

Attached photo(s):
https://westnordost.de/p/207355.jpg

Unable to answer "What’s the name of this street?" for osm.org/way/748559352 via StreetComplete 54.0:

pier

Unable to answer "What are the opening hours here?" for osm.org/way/787670475 via StreetComplete 54.1:

Open as early as 7am, possibly before by appointment