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VectorTiles generated via the [openmaptiles-tools](https://github.com/openmaptiles/openmaptiles-tools) toolchain and using the OpenMaptiles-SQL-Layers as the query-source result in tiles which can contain duplicated keys. This is because PostGIS `ST_AsMVT` is used to generate the Tiles and due to the way they [implemented parallelization](https://trac.osgeo.org/postgis/ticket/4310). Although it is not prohibited by the Mapbox-Vector-Tile-Specification MapBox as well as MapLibre depending on version either throw a lot of warnings or even crash when encountering tiles with duplicated keys. https://github.com/mapbox/vector-tile/issues/55 https://github.com/maplibre/maplibre-native/issues/795 After investigating I identified the boundary layer in zoom-leves 1 - 4 as the only layers containing duplicated keys.