Digitakt: Strange behavior of BANK button in Mute Mode

I’ve noticed that after starting Digitakt the BANK button is normally lit up, as it should be in Mute mode, but after switching off/on different tracks or just exiting mute mode, the next time when M Mute mode activeted the BANK button is not lit up until the next Digitakt reboot.

Is this a software bug or something?

Well, I noticed I wasn’t running the latest firmware. It was 1.51. I installed the 1.51A update and the problem disappeared.