debugging
6 min read
The map fossilized half-loaded: the render loop stopped because its work was hidden in a buffer it could not see
Labels decayed 6980 → 2138 → 76 → 0 pixels across four probe runs — in commit order, looking exactly like a regression gradient. Every HTTP fetch returned 200. The frame trace said all 46 labels placed. The real bug: an upload staging buffer invisible to the render-on-demand idle predicate, a deadlock that fossilized the map mid-load on any machine. One line made the buffer visible; labels went 0 → 7,081 pixels with zero interaction.