Math riddle as duration for short periods

[cpycom]

Hi everyone,
if I enable "Use Custom Precision" (in this case set to minutes) I get a strange behaviour.
For most cases the displayed periods are totally correct.
But for very short periods (without custom period: "a few seconds") it shows strange math riddles, like "8 years, -95 month, -4 week, -23 hour, -59 minute".
I guess "1 minute" would be a much more helpful notation.

(I'm using Grafana 7.2 with grafana-discrete-panel 0.1.0.)