While testing the new open_ports API in Python Operator Framework (https://github.com/canonical/operator/pull/905), I found that opened-ports doesn't return the pending opened ports that have just been opened by open-port previously in the same hook execution. (It does return them correctly in the next hook execution, after they've been committed.)
This is inconsistent with how other pending objects are returned, for example pending secrets are visible to get-secret.
It makes writing charms slightly more annoying as whenever you call opened_ports() you have to think "did I just open ports in this hook? If so, merge the opened_ports() return value with what I might have just opened".
Here are some logs from a test charm showing the issue: open-port ran successfully 4 times (opening three unique ports), but then opened_ports() returned an empty set:
unit-database-0: 16:33:34 INFO unit.database/0.juju-log Running legacy hooks/start.
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 1 _on_start
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 3 success opening port 8080/tcp
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 5 success opening port 8080/tcp (again)
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 7 success opening port 8081/udp
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 9 success opening port icmp
unit-database-0: 16:33:34 INFO unit.database/0.juju-log TODO 11 success opened_ports: set()
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