Airport runways have disappeared

[lkernan]

A recent change seems to have caused runways and taxiways to disappear when an airport area is defined around them. The runway and taxiway text still appears.

An example here:
https://www.openstreetmap.org/#map=15/-37.6642/144.8399

[pnorman]

On first inspection, I'd expect this to be a layering issue where e3ae617 removed the transparency and for some reason it was rendering on top... but that's coming from the landcover layer, which I'd expect runways to render on top of, and in any case, that commit was part of v2.18.0, so it doesn't seem to be a likely cause of the regression.

[matthijsmelissen]

This is more widespread: http://www.openstreetmap.org/#map=15/51.4488/5.3748
Trying to fix it now.

[pnorman]

My server is doing a raid resync, so I wasn't able to bisect the problem.

[matthijsmelissen]

The problem is in 8d41ab9.

[matthijsmelissen]

Aeroways tagged as areas still render, aeroways tagged as lines stopped rendering.