Broken webhooks in 24.2

[neoformit]

Describe the bug

It seems that the new masthead in 24.2 has broken some features of webhook plugins.
JavaScript that used to work now seems to be broken - even an alert('HELLO WORLD') does not work in most cases.
The GTN plugin is not affected by this - it seems to have been written for compatibility with Vue.

This seems to affect webhooks that use the function property in config.yml, or those that rely on document $(document).ready. My suspicion is that the document is not actually ready, because Vue is still rendering something. I seem to be able to work around this by using a setTimeout to call my entrypoint.

Galaxy Version and/or server at which you observed the bug
Commit: release_24.2

Browser and Operating System
Operating System: Linux
Browser: Chrome

To Reproduce
Steps to reproduce the behavior:

1. Checkout branch release_24.2
2. Enable the tool_list demo webhook by copying ./config/plugins/webhooks/demo/tool_list/ to ./config/plugins/webhooks/
3. run.sh and open in the browser
4. Click on the "Tool list" masthead icon - the first thing that happens is an alert() but even that does not appear in my browser. There are no error messages.