I have no experience of this developer but it still seem incredible to me that a brand new developer is susceptible to a kind of sudden death that prevents even a trace of development.

I'd hope that Rollei will ask for the remains, if there are any, of the suspect developer and thoroughly test

If it is sudden death and the stuff is brand new this would put me off ever using it again.

If this was an Ilford developer Simon Galley would have men demanding it back in the middle of the night for immediate testing.

This kind of quality control can ruin a company