OK, sorry, forget what I said - the same map tile that earlier was failing is now served fine. :/

Here is some more insight on the issue. Remember, we are seeing this when reading small chunks from a cloud-optimized GeoTIFF on S3 with our Terracotta tile server. On our latest encounters of the iss

The `r+` trick is very neat for changing the metadata in-place. But for actually changing the data values to match the new metadata, both your suggestions are fine - either used masked arrays or do th