setContents without html tag will cause crash when editing

[cub]

Describe the bug
Init a wysiwyg and then set some contents without html tag like this editor.setContents('Try to edit me, set me bold, add new line, ... Crash x_x');.
Then try setting a style to the existing text or add a new line. This causes an error:
Cannot read properties of undefined (reading 'textContent') (style like bold)
or
Failed to execute 'createElement' on 'Document': The tag name provided ('#text') is not a valid name. (new line)

In version 2.44.3 no problem. Since 2.44.4 it crashes.

To Reproduce
https://stackblitz.com/edit/js-w6byqc?file=index.js

[JiHong88]

The 2.44.6 version has been updated.
Thank you.