I’m getting this error, also. The only way I’ve been able to add titles is by converting it to HTML.
I also get it in the AB Profile Box (but for the “Add Title” and “Add Profile Text…” areas; “Add name” has been completely successful so far). After reading some of these comments after already having the issue with the Accordion, I tried clicking it multiple times but it just highlights it like it’s static text. If you press Enter, it’ll just knock you down to the next block and if you press Back, you’ll either delete the whole block or even go back a page. It seems to vary from block to block because sometimes I can get the “Add Title” to work (only the Profile Box, never for the Accordion).
The only error the console gives me is:
wp.editor.RichTextProvider is deprecated and will be removed from Gutenberg in 4.0.0. Please use wp.data.select( 'core/editor' ) methods instead. Note: This is a global warning, shown regardless of whether the component is used.
I’m really excited about this plugin so I hope the information I provided helps!