Extract large bounding box with --maxzoom fails without --overfetch=0

[bayview]

This extract command fails with main.go:179: Failed to extract, EOF

Repeatable, and also occurs with a local copy of the 120GB source data.

./pmtiles extract https://build.protomaps.com/20250324.pmtiles basemap.pmtiles --bbox=-180,-60,180,85 --maxzoom=5
fetching 1 dirs, 1 chunks, 1 requests
Region tiles 993, result tile entries 840
fetching 840 tiles, 15 chunks, 1 requests
fetching chunks 100% |██████████████████████████████████████████████████████████████████████████████| (15/15 MB, 1.4 MB/s)         
2025/03/29 15:29:28 main.go:179: Failed to extract, EOF

The same request succeeds if I set overfetch to zero:

./pmtiles extract https://build.protomaps.com/20250324.pmtiles basemap.pmtiles --bbox=-180,-60,180,85 --overfetch=0 --maxzoom=5
fetching 1 dirs, 1 chunks, 1 requests
Region tiles 993, result tile entries 840
fetching 840 tiles, 15 chunks, 15 requests
fetching chunks 100% |███████████████████████████████████████████████████████████████████████████████| (14/14 MB, 1.7 MB/s)        
Completed in 16.22702957s with 4 download threads (51.765480846691545 tiles/s).
Extract required 19 total requests.
Extract transferred 15 MB (overfetch 0) for an archive size of 15 MB

[bdon]

Thanks for the detailed report. Should be fixed in 1.27.1:

extract https://build.protomaps.com/20250324.pmtiles basemap.pmtiles --bbox=-180,-60,180,85 --maxzoom=5
fetching 1 dirs, 1 chunks, 1 requests
Region tiles 993, result tile entries 840
fetching 840 tiles, 15 chunks, 2 requests
fetching chunks 100% |████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| (15/15 MB, 12 MB/s)
Completed in 3.304664792s with 4 download threads (254.1861374067469 tiles/s).
Extract required 6 total requests.
Extract transferred 16 MB (overfetch 0.05) for an archive size of 15 MB