QGIS 3.14: Wrong GRASS path "boycots" the activation of OTB

I want to run OTB with QGIS on a MacOS (I work with QGIS3.14) and tried to activate OTB under Preferences > Processing > Providers. I activate OTB and set the OTB-path, but when I try to confirm I got a warning that the GRASS-Folder is not valid – see image below.

The GRASS-Folder (/Applications/QGIS 3.app/Contents/MacOS/grass7) is indeed wrong, but I didn’t changed that and have no clue where GRASS is located within QGIS.
I also work a lot with GRASS-Tools and they work well, so no idea how important this path is.

The big problem is, that the OTB settings are not applied with that wrong GRASS parameter.

Any ideas how to solve that?