Currently, when a content editor editor is editing a node and purposefully removes a metatag field value for that node, the empty value does not get saved and does not override the configured default value.
massageFormValues() method of Drupal\metatag\Plugin\Field\FieldWidget\MetatagFireHose,, don't remove empty values for individual fieldspreSave() method of Drupal\metatag\Plugin\Field\FieldTypeMetatagFieldItem, update code so that the entity tag field value is removed from the serialized string when either a default value exists and doesn't match or the default value doesn't exist but the entity value is empty.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Patch #3 worked for me.
Drupal version : 10.1.6
drupal/metatag: 1.26.0
Not only does this work well, but it even works for the 2.1 branch without a need for re-patching. Great work @godotislate
We've had the patch #3 (same as MR) many years on production. So +1 for RTBC.
The MR base branch should be updated to 2.1.x but it requires the author's or module maintainers action.