style-editor New Site Styles Saving Hangup

If you find yourself frustrated with saving updated color or other styling's this is the proper process with less glitches:

1. Click Edit on your page.
2. Click the Paintbrush in the top right.
3. Edit your styles.
4. Click close on the right-hand site styles editor.
5. Click Done/Save in the top left.

Furthermore, if you don't do the exact process, after you hit Done/Save, you can simply hit the ESC key and it will back out of the editor into the main Squarespace Panel.

I'm getting this error every time I make an edit to my Site Styles. I can't edit anything.

I've removed custom CSS, cleared my cache, restarted, etc. Nothing seems to fix it, and I don't have a paintbrush when I go to edit pages so I don't know how to bypass this error.