Unable to load macros related to third party add-ons in Confluence

Summary

• Macros related to third party add-ons stopped working. Users getting "500 Internal Server Error".

Steps to Reproduce

1. Install a third-party add-on (example: Better Code Macro for Confluence, Draw.io, Smartdraw).
2. In a new page, try to adding a macro for that add-on
3. Publish the page.

Expected Results

• The macro loads normally after publishing the page.

Actual Results

• A 500 Internal Server Error is thrown on the Browser developer tool.
• And the error "App is not responding. Wait or cancel? " is showing up

Notes

• Changing the browser does not fix the issue.

Workaround

• Currently there is no workaround.