Error with Advanced Workflow module

[lhalaa]

Uncaught Exception Error: "Call to a member function hasExtension() on null" at /var/www/mysite/www/vendor/silverstripe/versioned-snapshots/src/Handler/Elemental/PageSaveHandler.php line 35 {"exception":"[object] (Error(code: 0): Call to a member function hasExtension() on null at /var/www/mysite/www/vendor/silverstripe/versioned-snapshots/src/Handler/Elemental/PageSaveHandler.php:35)"} []

The error is thrown when saving a new workflow action from the Workflow admin section.

For reference, we are using:
silverstripe/recipe-cms: 4.6.1
silverstripe/versioned-snapshot-admin: dev-master#ad702dc
silverstripe/versioned-snapshots: dev-master#9bb7d6a

Looks like $form->getRecord() returns null from Handler::getRecordFromContext()