Pasted text will be applied the underline/strikethrough format of prior text

[Echo-az]

Describe the bug
When pasting as is, pasted text will be applied the underline/strikethrough format of prior text, but keep other styles like color and font.

To Reproduce
Steps to reproduce the behavior:

1. Input some text and apply underline/strikethrough format
2. Copy some other text and paste it there, then select "Paste as it"
3. Check the text

Expected behavior
Pasted text should keep its original style, including underline/strikethrough

Screenshots
Mac

Demo Site:

OWA:

Device Information

• Browser: both edge, chrome and safari

[JiuqingSong]

Thanks for reporting. This is a duplicate with #456 and will be fixed by Content Model changes.