Text expander apps replace block content on the Classic Block (inline)

[jartes]

Description

Quick summary

When using a text expander software or in the Classic block, the block itself is removed and the text that is inserted using the text expander is added through a Paragraph block.

This is only happening when using the inline Classic Block:

This works fine when using the pop-up Classic Block (which is displayed this way when the Custom Fields appearance option is off):

What actually happened

The entire Classic block (and text already added to the block) is removed. The text inserted using the text expander app is added as a Paragraph block.

It could be related to #61377

Step-by-step reproduction instructions

1. Create a new post or page.
2. Make sure you don't have the Custom Fields appearance settings
3. Add a Classic block.
4. Write a few sentences/words inside the block.
5. Insert a line using a text expander app, like "Text Expander" or "TypeIt4Me".
6. Check what happens.

Screenshots, screen recording, code snippet

Screen.Capture.on.2024-08-22.at.15-17-20.mov

Environment info

• WordPress 6.6.1
• Gutenberg 19.0.0
• Twenty Twenty-Four: 1.2
• Chrome 127 on macOS 14.4.1 Sonoma

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

[miminari]

I could be reproduced this.
I used TypeIt4Me.

Environment info
WordPress 6.6.1
Gutenberg 19.0.0
Twenty Twenty-Four: 1.2
Safari 17.1.2 and Chromium Engine Version 126.0.6478.127 on macOS 12.5.1

[t-hamano]

This issue may not fundamentally be a problem with the text expansion app.

There have been reports of issues with non-modal classic blocks where text pasted from outside WordPress gets converted to a paragraph block:

• Pasting with keyboard shortcut deletes all the content of the classic block #64771