Thank you, Even! Your fix works as described. The MVT MBTiles version of the Azusa GeoPDF rendered in WebGL looks like this now, much more complete: https://i.imgur.com/Nnq6Brp.jpg
I took the layers that got skipped and did a raster render of them for reference: https://i.imgur.com/9MjQ9hk.jpg Any ideas on how to extract the rest of the information? I suppose as a transparent png overlay tile layer the text labels would be much smaller than the full topo tiles... so rendering the raster labels on top of the vector terrain might work OK. But I would love to render everything in WebGL :D Max
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