on Chrome, shift-arrow down then delete doesn't delete text

[jaked]

Description
If you position the cursor at the beginning of a paragraph, shift-arrow down, then press delete, the text should be deleted. On HEAD on Chrome, instead the cursor moves to the previous line and the text is not deleted.

I bisected the issue to 2d1aaafa from #4455. Not sure what the problem is. I see that the change affects Chrome only, and I tested on Safari; the bug is not present.

Recording
Bug at 2d1aaafa :

Correct behavior at previous commit 8eb1abac :

Sandbox
https://www.slatejs.org/examples/richtext

Steps
To reproduce the behavior:

1. position the cursor at the beginning of a paragraph
2. shift-arrow down to select paragraph
3. press delete
4. see that the cursor moves to the previous line and the text is not deleted

Expectation
Text should be deleted.

Environment

• Slate Version: HEAD
• Operating System: MacOS
• Browser: Chrome 93.0.4577.63

[TheSpyder]

Duplicate of #4492