Consider the MWE:

\definetextbackground[background][
  background=color,
  backgroundcolor=gray]
\starttext
\starttextbackground[background]
Test
\stoptextbackground
\stoptext

In the latest version 2021-06-24 of ConTeXt LMTX, the textbackground is not working. Could this be a bug or am I doing something wrong?

Cheers,

Christoph