Hi,
after upgrading Geoserver from version 2.13 to version 2.15.3, I have encountered an odd issue concerning GWC and MVT: Mapbox vector tiles (pbf as well as generated mbtiles) that are generated by GWC are rendered at the wrong location on the map. Coordinates, extent, and scaling of vector tiles generated by GS >=2.15.x differ greatly from VT that were generated by previous GS versions (GS <= 2.14.x). This deviation can be examined by using the QGIS mapping software. Steps to reproduce this issue by using the topp:tasmania_roads layer: 1. Enable caching for the topp:tasmania_roads layer 2. Generate MVT with GS 2.14 - Use the GWC integration to seed MVT (MIME "application/x-protobuf;type=mapbox-vector") using the default EPSG:900913 gridset 3. Generate MVT with GS 2.15 - Use the GWC integration to seed MVT (MIME "application/vnd.mapbox-vector-tile") using the same gridset 4. Open QGIS and add one arbitrary pbf-file that was generated by GS 2.14 to the QGIS map (Note: "Vector Tiles Reader" plugin must be installed) 5. Add the pbf-file that was generated by GS 2.15 and the same coordinate (XYZ) to the map 6. Examine if the rendered position, scale and/or extent differ Any help is appreciated. Thanks, Mauro
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