What's the approach to achieve this, or which elements are causing this?

Even an empty R_2000 DWG causes a recovery warning (even though it doesn't find errors):

int error;
Bit_Chain dat = { 0 };
Dwg_Data* dwg = dwg_new_Document(R_2000, 0, 1);

dwg->header.codepage = CP_ANSI_1252;
dat.opts = dwg->opts;
dat.version = dwg->header.version;
dat.from_version = dwg->header.from_version;
dat.codepage = dwg->header.codepage;

dwg->header.is_maint = 0xf;
dwg->header.zero_one_or_three = 1;
dwg->header.maint_version = 0x8;

unlink("out.dwg");
error = dwg_write_file("out.dwg", dwg); // returns 0

(Note that I have to set additional header fields with code taken from dxf_fixup_header, otherwise DWG Trueview complains about an unsupported version).

My use case is to simply generate a DWG with simple entities and no recovery warning, either through JSON or the API.

If I export "test-data/2000/entities-2d.dwg" to JSON and back to DWG R_2000 then I don't get the warning, but I haven't yet been able to change anything in the JSON or use for instance dwg_add_LINE and get a non-warning DWG or convert any other ("empty") AutoCAD DWG to a non-warning DWG.

Uh oh!

add dwgwrite flag to help avoid recovery mode but with data-loss #984

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