[BUG] TurnInto is only effective for the first line of text.

[johncodeai]

Has this bug been raised before?

• [X] I have checked "open" AND "closed" issues and this is not a duplicate

Description

TurnInto is only effective for the first line of text.

Steps to Reproduce

For example:

1. Copy a multi-line text from somewhere else. Such as:

11
22

2.Click the menu on the left side of the block, click the ""Turn into" button, and try to convert the block to any format such as Heading 1.

3.TurnInto is only effective for the first line of text.

Expectation: All selected text will be formatted.

Environment

• Browser: Chrome

Screenshots

No response

Do you want to work on this issue?

No

If "yes" to above, please explain how you would technically implement this

No response