Die Abtrennung zwischen "baden erlaubt" und "baden verboten" ist bereits hier ungefähr. (Da ist eine Bojenkette im See, und weiter südlich stehen am Ufer auch Schilder "Baden verboten".)

according to satellite images, there is no extra bridge for a service road, track or path.

Here are tags `maxspeed=knowledge` on different tram tracks. This is not an established tag according to the OSM wiki. What information should be conveyed here, and how to do it correctly?

via StreetComplete 45.2

According to the timetable [1], bus line 456 does not take this route but goes via Lampertswalde Bahnhof and then takes the road north of the railway.

[1] https://www.vvo-online.de/de/fahrplan/fahrplanbuch/linien?line=456

Is here an (informal) path along the edge of the field?

Check access rights at this gate and the path and the gates behind! 2022-10-31: Thus gate was closed but not locked. Is it legally restricting access (and if som for which modes of movement), or just a leftover? Do the gates further on thus way allow foot and bicycle passage?

Add height tag. Add tag describing the quality of the oath.

Here are downwards steps.

via StreetComplete 45.1

Attached photo(s):
https://westnordost.de/p/107041.jpg

Unable to answer "What kind of building is this?" for way/549564873 via StreetComplete 45.1:

It's a car_wash