DXF export results in segmented paths - not hatchable

A company I work at uses laser marking systems. I've been working with these recently and I discovered a problem with DXF files exported from Inkscape. I've noticed that problem before, but I never needed to hatch a path so it wasn't a deal breaker.

Right now we export DXF files form Corel Draw X5 - these are then imported into laser engraving software and hatched fro marking.

When I tried to do the same using Inkscape instead of Corel Draw - the hatching didn't work as expected. At first I couldn't understand what is going on, because it seemed that only small parts of the imported shape are hatched - the ones closes to the edges - then it came to me what is going on.

Inkscape's DXF exporter seems to split every path into individual spline segments - each becoming a separate object.

When fill of hatch is then applied, each individual curve segment is filled on it's own, but not the overall shape - which usually means that only tiny parts of the curves are being affected, leaving great majority of the shape empty.

I've tried using a built-in function to merge close points in the laser marking software, but it made no difference.

If this problem is fixed, we can migrate our workers form Corel Draw to Inkscape :)