Follow-up Comment #4, bug #65910 (group groff): I think you're right that this is problem is nestled pretty deeply in _pic_. It reproduces even when telling GNU _pic_ to produce TeX output.
$ cat EXPERIMENTS/dashed-ellipse-8x3.ptex
.PS
linethick=2;
ellipse dashed 0.25 width 8 height 3
.PE
\centerline{\box\graph}
\end
$ pic -t EXPERIMENTS/dashed-ellipse-8x3.ptex >|
EXPERIMENTS/dashed-ellipse-8x3.tex
$ tex EXPERIMENTS/dashed-ellipse-8x3.tex
This is TeX, Version 3.14159265 (TeX Live 2020/Debian) (preloaded format=tex)
(./EXPERIMENTS/dashed-ellipse-8x3.tex [1] )
Output written on dashed-ellipse-8x3.dvi (1 page, 2124 bytes).
Transcript written on dashed-ellipse-8x3.log.
$ xdvi dashed-ellipse-8x3.dvi
Screenshot attached.
(file #56251)
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