Few warnings in 2.2.0 when syndicating content

Hi guys,

Could you check debug.log when WP_DEBUG is enabled, please.

We found 2 entries when syndicating content in WP 7.0.4 multisite with syndication 2.2.0 active on the first subsite:

```txt
[20-Aug-2026 10:32:11 UTC] PHP Warning: Undefined array key "post_guid" in /XXX/wp-content/plugins/syndication-2.2.0/includes/class-syndication-logger.php on line 185
[20-Aug-2026 10:32:11 UTC] PHP Warning: Attempt to read property "ID" on int in /XXX/wp-content/plugins/syndication-2.2.0/includes/class-syndication-logger.php on line 186
```

Cheers!

// T

Start at includes/class-syndication-logger.php lines 185-186 and reproduce syndication on a WordPress multisite with WP_DEBUG enabled. Trace the logger input around the missing post_guid and integer value, then confirm the same scenario completes without these warnings in debug.log.

Written by the indexing model from the issue text.