What version of Hono are you using?

4.2.9

What runtime/platform is your app running on?

Node v20

What steps can reproduce the bug?

Declare multiple routes, include one route using optional parameter like /api/:a/:b?

What is the expected behavior?

RPC mode should work normally

What do you see instead?

RPC got fallback to match any string, with no known HTTP methods

Additional information

No response