I’m sorry, I don’t think I’m explaining this very well.
The issue is with TinyMCE core software. I can’t change this from my plugin. I can only extend/modify/enhance what is made available in the core software.
If the core software does not allow for something (or if there is a bug); I simply can’t fix it from a plugin. It would have to be fixed in the core.
I am not part of the Tinymce team. I have no influence, connections or other “insider” perks. I’m simply an end-user, creating what I can for the WP community.
So to answer your question, regrettably no. It’s not something I can solve with an update. It will have to be solved in the core Tinymce software.