[NTG-context] \externafigure and \at do not work together

Hello, perhaps this is how it is supposed to work, but: \externalfigure[clock.jpg][clock] \starttext \at[clock] refers to a clock \stoptext produces "?? refers to a clock", instead of "1 refers a clock" --- the wiki of \at says, that labels of figures can be refered to. Is this a bug, or can only some labels be refered to? I was able to fix it using: \reference[clock]{\externalfigure[clock.jpg]} \starttext \at[clock] refers to a clock \stoptext and \externalfigure[clock][] \starttext \at \stoptext produces an interesting artwork... so I thought maybe this could be a bug. LMTX 2021.10.21 Best, Andrej