Couldn't load plugin due to "No module named 'processing.algs.grass7'"

Trying this plugin I get this error:
```
Couldn't load plugin 'processing_workflow' due to an error when calling its classFactory() method 

ModuleNotFoundError: No module named 'processing.algs.grass7' 
```
Google suggests this is due to a change back in QGIS 3.22:
https://gis.stackexchange.com/questions/415644/error-algorithm-not-found-using-grassprovider-in-pyqgis-standalone-script