EventBridge max EventBuses on event path

Yes, there is a limit when sending events between buses in the same region. An event can traverse from a bus to a different bus only once. If you look at the doc, you will see:

EventBridge can't route events received from a sender event bus to a third event bus.

If you need to send it to two buses, just create two rules on the first event bus that will route to both buses.