Chrome Extension "Refused to load the script" (Tried updating manifest)

Question

I know this question has been asked before but the answer I've viewed don't fix my issue. I'm developing a Chrome extension:

I get this error: Refused to load the script '<URL>' because it violates the following Content Security Policy directive: "script-src-elem 'self' 'unsafe-inline'".

Here's my manifest (v3):

"content_security_policy": {
        "extension_pages": "script-src 'self'; object-src 'self'; script-src-elem 'self' 'unsafe-inline';"
    },

I even tried:

    "extension_pages": "script-src 'self' https://example.com; object-src 'self';"

And entered the domain I was getting an error on, but then Chrome doesn't allow me to upload the extension.

Any solution?

The script I'm getting an error on is a link to my firebase relational database. I'm not even calling this script anywhere in the code, I think it's being called when I'm trying to access my database:

https://xyz-310ie-default-rtdb.firebaseio.com/.lp?start=xyxyz

I'm changed the script a bit above to keep it confidential.

Also note that I'm getting this error in my App.js (react file), where I'm just removing the item from my db using:

const itemRef = ref(db, 'items/' + itemToRemove.firebaseKey);
remove(itemRef)

Adding the item works fine (adding it is done in background.js of the plugin).

And note that it doesn't happen always.

• If I reload the plugin, I can remove the items.
• If I add a few items, and then try to remove them, it gives me that error. Even though the items are successfully added in the db.