I found a bug in the typography field.
Steps to re-produce the bug:
1. create an accordion field
2. add typography field in one of the accordion tab
3. set "font_wight" and "font_style" to false in the typography field
1. You get a JS error "$extra_font_style_block is undefined" in main.js
2. The JS error prevents the normal functioning of the accordion tabs
Thanks for report mate. I'll check it deeply.