Some places are not rendered

[ostfriese4]

Some items, like memorials, trees or benches but also some types of lines, like hedges, are not shown on the map.
With most of them I can understand that since they may not be important enough to be shown, but I think at least memorials should be visible since they are important for tourism. Furthermore, I can't comprehend why some other unimportant (if that is why some places are hidden) types of object, like waste baskets or post boxes, are shown.

[cmahnke]

Have a look here: https://openmaptiles.org/schema/
The things you've mentioned aren't part of the schema. You might want to have a look here https://github.com/onthegomap/planetiler#generating-custom-vector-tiles