This issue is not caused by the plugin but nonetheless critically affects it.
When automatically updating my plugins in bulk, the process hung and ended up failing on this plugin:
The plugin editorial-calendar/edcal.php has been deactivated due to an error: Plugin file does not exist.
It's worth highlighting that the plugin is alphabetically last in my plugin list therefore the failure may or may not be specific to this plugin.
Either way, I had to manually delete and reinstall the plugin. This resulted in a loss of all scheduled data.
The purpose of this topic is simply to share the knowledge with the plugin developers though it doesn't seem like action is necessary on their part.
As advice for others, back-up before updating plugins, avoid bulk updating of plugins (other issues occur such as your website being taken offline during maintenance and unexpectedly hanging). Also, it may be worth checking if data can be preserved via the back-end databases before manually reinstalling and wiping potentially salvageable data.
In any case, thank you for well designed and well built plugin.