On save data output do not display as expected

Describe a bug.
I noticed that on save data output does not show result instead "Block «header» skipped because saved data is invalid"


Expected behavior: It should display as


The reason the output is not showing as desired as I figured out that Microsoft Editor is installed and when it finds a grammatical error highlight with an underline "Seen in above picture **World** is underlined blue". This adds additional div element to the block under the h1 element

If I click in the underline word "World" and click ignore the underline disappears and so the additional div element is removed

Following the click on ignore, on save data output displays as expected. Kindly can you look into the issue.

Screenshots:

Device, Browser, OS: Lenovo, Microsoft Edge, Windows

Editor.js version: 2.20.2

Plugins you use with their versions: Header 2.6.1