Flutter Dev Debugs Three Stacked Bugs That Silently Erased Noise Map Contours

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A developer building Ihanyi Elechi, a Flutter app that visualizes urban noise pollution as a live heatmap over Mapbox, encountered a silent rendering failure where contour layers simply disappeared on certain Android devices without any crash or error log. The first bug traced back to Firestore documents storing coordinates as integers rather than doubles, causing some readings to default to 0.0 and corrupt the bounding-box calculation used to position the raster image. A second issue stemmed from a legacy Firestore query that required a composite index due to a combined where and orderBy clause, which silently returned empty or partial snapshots in release builds depending on cached index state. The third bug involved off-main-isolate PNG rendering that could complete after the map layer update window had already passed, meaning valid image data arrived too late to be painted. All three bugs were individually non-fatal, but their simultaneous occurrence produced a consistent, device-dependent failure with no visible error — making diagnosis especially difficult.

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