I've been trying to configure the network seen below in Packet Tracer, and so far the big networks are working as expected. My problem is with the connection with the net on the bottom, it is supposed to be a collapsed-style architecture hence the missing core switch. The problem is that the pings report a destination host unreachable and when I trace the PDU using the simulator, the PDU gets bounced back in the core switch (Even though it works perfectly fine when pinging the other network).
I would appreciate any insight on what the issue could be, thanks in advance.
Project link: https://ufile.io/5wo8trqb