Consider trying to export a public key with a subkey, where that subkey's expiration date or other configuration settings have been updated:

$ gpg --export-options export-minimal,export-clean --export AB9942E6D4A4CFC3412620A749FC7012A5DE03AE | gpg --list-packets | grep ^:
:public key packet:
:user ID packet: "REDACTED <REDACTED>"
:signature packet: algo 1, keyid 49FC7012A5DE03AE
:public sub key packet:
:signature packet: algo 1, keyid 49FC7012A5DE03AE
:signature packet: algo 1, keyid 49FC7012A5DE03AE
:signature packet: algo 1, keyid 49FC7012A5DE03AE
$

both export-clean and export-minimal should drop two of the three subkey binding signatures, and only export the most relevant one.

The most relevant binding signature for a given subkey should be (first match wins):

• the most recent cryptographically-valid revocation signature, or
• if signing-capable, the most recent cryptographically-valid signature with a cryptographically-valid cross-sig, or
• if not signing-capable, the most recent cryptographically-valid signature

Of course, if there is no match at all, the subkey should not be emitted at all anyway in these modes.