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During a network audit, it was discovered that a particular subnet $(10\mathrm{.}0\mathrm{.}5\mathrm{.}0/24)$ was not reachable from certain parts of the organization's RIP$-$based network. The network consists of multiple routers, with Router E directly connected to the $10\mathrm{.}0\mathrm{.}5\mathrm{.}0/24$ subnet.

The audit revealed that Router E is correctly advertising the subnet in its RIP updates.

What could be the reason for the reachability issue?