BUG: Using multiple labels not saving

I am trying to set up multiple labels in my document. The labels are all set up in the JSON content type setup, but when I apply multiple labels on the same line or string and then save the document, it doesn't the labels appropriately. Instead, only the first label is applied to the entire string.

I am trying to apply only the trademark label to the ®. I don't need to apply the font-style-2 to the ®. It allows me to do it, but then when I save and look back, font-style-2 is applied to the whole line.

Even after removing all the style and re-applying them manually to each portion of the text, it is not reflected in the API response. See attached screenshot for reference.