Dropped holes when buffer(0) -ing a valid geometry

[astronomiser]

Passing along this bug report from ​the Shapely github.

​The WKT in a text file

Running buffer(0) leaves the geometry mostly unchanged but there is a group of holes which are removed in the lower right of the geometry.

I was able to replicate this behavior in PostGIS (w/ GEOS 3.5). The user is using Shapely with GEOS 3.8.1. Buffering the geometry in JTS did not produce the same effect.

[mdavis]

Confirmed that this still happens in the GEOS main branch (3.10dev).

[jorisvandenbossche]

Using shapely with GEOS 3.11.1, this seems to work now.