The arrow looks fine to me in ConTeXt ver: 2022.01.10 08:36 LMTX. (See attached PDF)

> On 20 May 2022, at 17:56, Vincent Hennebert via ntg-context <ntg-context@ntg.nl> wrote:
> 
> Take the following MetaPost file:
> 
> beginfig(0)
>  ahlength := 20;
>  linejoin := mitered;
>  drawarrow origin--(40,0) withpen pencircle scaled 5;
> endfig;
> 
> Render it into PDF with ConTeXt. Witness the cut out ends of the arrow.
> How to fix that?
> 
> Being able to add some margin would be a solution, which may be
> desirable anyway in some cases. Is that possible?
> 
> Thanks,
> Vincent

—
Bruce Horrocks
Hampshire, UK