Hi list, While tracking down the failures from https://github.com/qgis/QGIS/pull/63180, it's revealed that using QGIS with libspatialindex >= 2.0 gives completely misleading results for nearest neighbour geometry searches.
The root cause is an optimisation from the upstream library ( https://github.com/libspatialindex/libspatialindex/commit/6fe9ff769243579ed74f7f27409dd1dda6591634) that breaks how downstream clients could previously implement custom nearest neighbour comparators. From my research I don't think this is fixable in QGIS, and will need an upstream fix. In the meantime, any QGIS build with libspatialindex >= 2 will be silently broken and give COMPLETELY INCORRECT results for anything based on a nearest neighbour query. This also affects downstream clients like QField/mergin. Do NOT use in production -- you have been warned!! Nyall
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