My thought was maybe because the plugin is not downloadable during this locked review process the update process isnt happening correctly.
There was no php errors sadly. No errors at all other then the custom url no longer working.
What happened is on the 27th the update was applied, after that links that normally pointed to (custom login url example: hello) pointed to wp-login.php like the login button went from /hello back to /wp-login.php
I tried to turn the plugin off and back on, change the url, hide the default url on/off the link for the login button did not change.
Rolling the plugin back to 1.1.7 caused the url to point again to the correct url.
I was not able to investigate the issue further as my clients customers were messaging about noting being able to login but if I had time I wish I could have checked the DB to see if the url value was being updated.
I should also mention this “bug” did not replicate itself on my other clients websites that also use this plugin but those updates were applied before the plugin was locked for review.
During the clients next maintenance window I was planning on DL the plugin from client A and uploading it to client B (the one that had the issue) and see if that solve the issue or if the issue re-appears.