Issue Summary

Contents in the code block get squished into 1 line when pressing backspace at the start of the code block content

Steps to Reproduce

1. Create a Multi-Line Text Field using the 'Wiki Style Renderer'
2. Add any multi-line Plain text (for example YAML script)
3. Remove the code block by pressing the backspace at the start of the code block
4. The multiline plain text is converted to single-line rich text

Expected Results

The Multiline plain text format is expected to be retained

Actual Results

The multiline plain text is converted to single-line rich text

Workaround

To retain the plain text structure without losing the YAML format, please add a few plain text characters before the code block. Then, you can remove the code block and then remove the initial plan text characters. Reference Video.