Steps to reproduce

1. Install Ibexa Experience 4.6.7
2. Create Landing Page content item
3. Add a block with a rich text attribute
4. Close the block configuration widget
5. Open the block configuration widget (may require repeating the opening and closing widget a few times, attached recording showing the issue)

Result
The configuration widget is loading endlessly with no visible JavaScript error or failed backend request

Expected result
The block configuration widget shows normally

Note
Reproduced on Chrome Version 126.0.6478.114 (Official Build) (arm64).
I was not able to reproduce the issue on Firefox ver 127.0.1 (64-bit)