add the other bug

.changelog/v0.53.0/summary.md

@@ -12,10 +12,11 @@ breaking changes.
 For more information and background context on the changes to `ibc-testkit` and
 the rationale behind the overhaul, please refer to [ADR 009][adr-009].
 
-This release also includes a fix to the proof verification logic for
-`PacketTimeout`s, which was verifying an incorrect field. It also bumps the
-minimum-supported version of `ibc-proto` to 0.44, and the version of
-`tendermint` to 0.36. Note that the minimum-supported Rust version was reverted
-back to 1.71.1.
+This release also includes two fixes. One is to reject packets without height
+and timestamp timeout. The other is to correct the proof verification logic for
+a `PacketTimeout` due to a closed channel, which was verifying an incorrect
+field. It also bumps the minimum-supported version of `ibc-proto` to 0.44, and
+the version of `tendermint` to 0.36. Note that the minimum-supported Rust
+version was reverted back to 1.71.1.
 
 [adr-009]: https://github.com/cosmos/ibc-rs/blob/main/docs/architecture/adr-009-revamp-testkit.md