Agreed, there'd be little reason to have preferred shares that are unconvertible except to create value for insiders in an acquisition. I expect to see A/S increase. If they're clever about it, they do it all quickly as an uplisting + reverse split + maybe an A/S increase to balance everything out for all stakeholders.
Many people will see a R/S as good if it's tied to the idea of uplisting.
Whether they're intending to convert the Series B and dump, or hold the shares with the option to convert later, or use them in deals, it makes sense to unlimit their potential.