Thanks! Replacing "top" and "bottom" with "column:top" and "column:bottom"
didn't make the MWE work, but once you pointed out that the locations of
the marks to be fetched had to be column-specific, I started looking
through the mailing list and found something that worked. I just had to
change the \fetchmark calls in my MWE to \getmarking[TestMark][1][top] and
\getmarking[TestMark][2][bottom].

On Tue, Apr 28, 2020 at 10:32 AM Hans Hagen <j.hagen@xs4all.nl> wrote:

> On 4/28/2020 2:09 PM, Joey McCollum wrote:
>
> > Is there some way I can improve my syntax to avoid this issue, or is it
> > just a bug that needs to be fixed? I've tried fetching other marks
> > (e.g., first and last), but the only marks that ConTeXt seems to find
> > are the ones for the left column.
> column:top etc
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>