OK, so what has happened is that macOS update messed with your Neuman MT 48…
That is a known issue.
macOS Tahoe 26.5 introduced intermittent audio glitches (clicks/pops) and connection issues with the Neumann MT 48.
To fix this, you need to install the updated Neumann MT 48 Toolkit 2.0, and update your hardware firmware to v2.0
I also advise you to resist the urge to constantly update stuff. Updates can cause a lot of pain → [blog] Be careful with updates