Appsmith recently changes the cross site content security policy.
If you were using appsmith before, you would notice your sites stopped working on update. Here is how to fix that issue.
Edit your environment configuration file, for docker it is located in
stacks/configuration/docker.env
you should add the environment variable
APPSMITH_ALLOWED_FRAME_ANCESTORS="'self' http://*.yoursite.com"
Now, your appsmith app can be loaded in *.yoursite.com