We're using the Base64 Encoded Image formatter for media images displayed in generated PDFs. With the 9.4.x versions of Drupal core that added the loading attribute, the lack of settingsSummary() implementation in Base64ImageFormatter.php is causing the following error:
Notice: Trying to access array offset on value of type null in Drupal\image\Plugin\Field\FieldFormatter\ImageFormatter->settingsSummary() (line 210 of /var/www/html/web/core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php)
Install media on Drupal 9.4.5 with a configured image media type that has a view mode using the Base 64 Encoded Image formatter and view the "Manage display" tab for that formatter.
This problem is avoided by implementing the settingsSummary() function in Base64ImageFormatter.php
Patch forthcoming.
Needs review
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This just happened to me as well. I believe #8 to be a correct assumption. Adding + parent::defaultSettings() to public static function defaultSettings() fixes the issue as well, though the patch above may be the better route since the default image settings are irrelevant to the Base64 formatter.