[metapost] Bug with in-box test alignment

[Sebastiano Vigna]

> On 29 Dec 2021, at 07:42, Sebastiano Vigna <sebastiano.vigna at unimi.it> wrote:
> 
> The following Metapost program
> 
> outputtemplate := "%j-%c.mps";
> 
> input boxes
> 
> beginfig(1);
> 	circleit.n0(btex $0$ etex);
> 	drawboxed(n0)
> endfig;
> 
> bye
> 
> 
> generates a circle with a 0 label inside, but the label is not centered (I'm converting the output of Metapost with mptopdf).
> 
> This behavior started in two different TeX installations after a recent upgrade. I'd like to know if this is reproducible elsewhere, or if anyone has met already this kind of behavior.

After input from other users, the "not centered" behavior appears to be there with TeX 3.141592653, but not with TeX 3.14159265. Can anyone reproduce it with that version?

Ciao,

					seba