Doesn't build routes with jruby

When I try to use the routes panel, it shows its "Running rake routes, Environment: Production". It then goes to "Failed to load routes" with a "Show details" link that opens a dialog with this line twice : "Unknown ruby string (do not know how to handle): jruby-9.2.20.1."

Let me know if you need any more info.

FYI, this use to work in the past (few years ago?).

Regards,
Rick