Spotted this when setting up a new database - last option, Bubble plugin data type… can’t find any reference to it anywhere.
Any ideas anybody?
No, but intriguing! 
This is because it’s a new app, and there is a plugin that lets you fetch the list of plugins Bubble offers as an example. Remove the plugin from your app and that’ll go.
Not a back door to a hidden superstore of plugin developer features then 
sorry no 