Resolving this ticket, since the original problem seems to have been solved.
> Beyond that, the problem appears to be that Rakudo is not > presently creating its grammars properly -- it appears to > be deriving them directly from Any instead of from a PGE > grammar class of some sort. As a result, inheritance and > method dispatch don't seem to be working quite properly, > and we'll need to get that fixed. Ticket [perl #65474] covers this issue, along with an example of what fails.