[Tile-serving] [openstreetmap/mod_tile] Tiles cache does not work for low zoom (#260)

[SomeoneElseOSM]

"render_list" will make a bunch of requsts for tile rendering, which should appear in syslog.  Are there any errors there?  For example this morning on a server of mine this happened:

    Rendering all tiles from zoom 5 to zoom 5
    Rendering all tiles for zoom 5 from (15, 9) to (23, 15)
    Waiting for rendering threads to finish

    Total for all tiles rendered
    Meta tiles rendered: Rendered 1 tiles in 25.03 seconds (0.04 tiles/s)
    Total tiles rendered: Rendered 64 tiles in 25.03 seconds (2.56 tiles/s)
    Total tiles handled: Rendered 2 tiles in 25.03 seconds (0.08 tiles/s)

and in syslog I see (among other things):

    Sep 20 06:42:01 map renderd[1791]: DEBUG: START TILE ajt 5 16-23 8-15, age 3.35 days
    Sep 20 06:42:01 map renderd[1791]: Rendering projected coordinates 5 16 8 -> 0.000000|0.000000 10018754.171400|10018754.171400 to a 8 x 8 tile
    Sep 20 06:42:26 map renderd[1791]: DEBUG: DONE TILE ajt 5 16-23 8-15 in 25.026 seconds

One of the corresponding tiles is I think https://map.atownsend.org.uk/hot/5/15/10.png .

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