Page Builder text editor visual tab disappears after saving.

The Page Builder SiteOrigin Editor widget (“a rich-text, text editor”) visual tab and font options (bold etc) disappear if I click Done and Update my page while on the text tab.

In other words, if I click Done while on the visual editing tab, I can then update my page and go back in and edit as normal. However, if I click Done while on the text editing tab within the widget, and then go back in to edit, my visual and text tabs disappear, as do the font options.

This is repeatable with something as simple as styling an h4 header: Hi.

Further experimentation: A blank editor widget says “tinymce” below the bold SiteOrigin Editor. If I delete the text from the text editor once the tabs have disappeared, and click Done, it instead shows “html”. And if I delete the text from the visual tab when everything is working and click Done, it shows “tmce”.

I have disabled all plugins save for the SiteOrigin page builder and widgets bundle. I have this same problem on at least two of my websites. They are fully updated. This does not occur with wordpress’s built-in text editor.

I have screenshots if needed.

Thanks very much,
Savannah