[Tile-serving] [openstreetmap/osm2pgsql] Ghost ways from rendering (#1394)

[gvghia]

I'm sorry if I bothered the wrong people with this. Please kindly suggest where to post.
I posted here as a result of the comments of ikonor, (see last link) who was able to recreate the problem with Docker and thus assuming the problem is in osm2pgsql.  As I understand it, somewhere the 2 ways with points a b c z and a x y z from a boundary relation are joined to draw. Expected result is a b c z y x a , but a x y z b c z is the actual result (second way is inserted between first and second point of first way) and this is creating a ghost line b z . 
I do not know at which processing  stage this joining of the 2 ways is done. There are 2 examples where the phenomena still exists, so you could verify.

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