Unable to save hatches to DXF R12

I have an AC1006 (Release 10) DXF where every shape is hatched. I need to convert it to an R12 DXF. I can open the original file and everything looks fine, but when I save it as an R12 DXF and try opening that, there's no geometry in the file. The file also has a size of 10kB, down from the original file's 1.4MB

I've also tried testing by creating a simple new file with four rectangles and hatching two of them. When I save the file as an R12 and open it, all four rectangles are visible, but none of them are hatched.

Is this a bug, or am I doing something wrong? Or perhaps an issue with Autocad's R12 DXF specification?

I've attached my original file.etching_wafer_hatch.DXF

What is the source of this R10 DFX?
I can't find HATCH in my R10 or R12 references, so I must assume, that HATCH isn't supported by these versions.
Opening the file could work by chance, when the reader falls back to R14 for HATCH. I haven't checked this yet.
Saving the file in R14 format worked for me. R14 is the oldest reference where I found HATCH entities.

I also tried to open the R10 with Autodesk TrueView 2019 and the file was rejected because of an invalid code in the first entity. Also an indication for an invalid or incompatible created R10 file.

The RF10 DFX was generated by KLayout. I was able to change the output options such that it writes SOLID entities instead of HATCH and now everything works fine. I'll submit a bug report with KLayout. Thanks for the help.

What is the source of this R10 DFX?
I can't find HATCH in my R10 or R12 references, so I must assume, that HATCH isn't supported by these versions.
Opening the file could work by chance, when the reader falls back to R14 for HATCH. I haven't checked this yet.
Saving the file in R14 format worked for me. R14 is the oldest reference where I found HATCH entities.

I also tried to open the R10 with Autodesk TrueView 2019 and the file was rejected because of an invalid code in the first entity. Also an indication for an invalid or incompatible created R10 file.

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NAML

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You're welcome, glad to hear that.

SOLID, iirc, are valid entities for R10 and R12. Good to know, that this works fine.