Vitali

Yes. Classes are needed. I solved problem with OL 7 and ol-ext using webpack and babel-loader: to force to transpile /node_modules/ol/* into JS without classes. As a workaround. It works....

So, my case is (not vector tiles, but a Vector Source with features) 1) useGeographic() 2) WebGL layer with feature source and preloaded features in EPSG:4326 3) Default Select tool...

in version 9.0.0-dev.1701358929517 selection is working normally, seems.

At least in ol/webgl/Helper buffer cache is never cleared (until the whole layer is disposed) , new buffers are added and added.. This is very likely related to memory consumption....