If you hit F12, you can disable caching while the debug window is open (under the Network tab for both Chrome and Firefox.) This allows you to zoom in and out repeatedly and not have to hard-refresh for every zoom level while the debug window is open.

image (chrome)

If tiles are still stuck, there is a way you can have the tile server re-render the tile, but this is rarely needed at zoom levels 13 and up.

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