I setup a generalPages plugin using online examples. When I visit that page url I can see the request go to my server and return with a 200 status code as well as the correct response. However, the page just has a spinner that continues to spin and I eventually get an error dialog saying "Something's gone wrong".
Looking at the console the only thing I see is "Error while parsing the 'sandbox' attribute: 'allow-storage-access-by-user-activation' is an invalid sandbox flag.", which may or may not be related.
Can anyone tell if that error is relevant? If so, how do I resolve this? If not, why isn't my page plugin displaying?