TinyMCE does not save content

[minauen]

I am using:

• TinyMCE 4.3.1
• MODX 2.2.0.pl2

I enabled the setting:
tvs_below_content to move the TVs below the content input field in the Document Tab.

The problem that I'm seeing is as follows:
I have a resource with a template that has multiple TVs of different Type, organized in a couple of categories. Now when I use any other TV input type before using the tinyMCE input type, the content in the rich text field is not saved.

If I use the rich text field first and save after editing, it works ok.

This is definitely not a major bug, but it's somewhat inconvenient for my clients to adhere to this restriction.