Export non-closed timezones into _polygon table using osm2pgsql

I’m trying to import all timezone objects as “polygons” into database.

I added

node,way   timezone     text         polygon

into /usr/share/osm2pgsql/default.style file (I know I can pass a custom file as parameter, but this is not the case here) but still not all timezones are added into *_polygon table but goes into *_line table instead.

I figured out that this is probably caused by non-closed ways like in the example here:

and maybe because of the mixed non-closed / closed (“holes”) polygons here:

While I do understand that this is probably an “issues” with the osm object itself - is there a way I can force osm2pgsql still import these as polygons instead of lines into DB?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/export-non-closed-timezones-into-polygon-table-using-osm2pgsql/106284