I have bubble app running on dedicated bubble instance and the ZQRTE does not load the text data for editing yet I used the editor to create the data in the first place and can confirm that text data is stored in bubble database ok . The text data that should load is in field: body as shown in screen shot.
The RTE is on popup window and data from RG is loaded onto popup as confirmed by the message subject that is filled out
Maybe you have problem with plugin not supported on dedicated environment?