Is anyone else having issues with javascript deleting?

Summary:

We have a custom UI that was built in early 2021. I'm not sure if it has anything to do with the recent release, but yesterday we noticed that our icons are gone from our screens. Now, I am noticing that popups we have coded (important messages we have coded) and my google analytics tags are missing. I go in and add the code back and when I preview, they are gone. I click back to see the code and the coding for the images are gone even though I know they were there. I