MathML not rendering correctly

[alishanster]

What is the current behavior?

Using wiris mathtype external plugin for tinymce, when I create and insert math equation, it renders correctly. However when I save everything and try to edit, content in the editor which supposed to be a math eqution does not render as it should.
P.S. everything worked fine with Vue2 and tinymce-vue^3

Please provide the steps to reproduce and if possible a minimal demo of the problem via codesandbox.io or similar.

1. Install tinymce-vue^5
2. Add wiris mathType editor as external plugin
3. Create equation and save
4. Edit equation after save (need to get the contents from db)

What is the expected behavior?
Render editable MathType equations correctly
Which versions of TinyMCE, and which browser / OS are affected by this issue? Did this work in previous versions of TinyMCE or tinymce-vue?
@tinymce/tinymce-vue^5
vue 3

[TinyITAdmin]

Ref: INT-3186

[alishanster]

UPD: downgrading to tinymce-vue^4 helped