Non breaking characters in place of spaces

Description

I have a Kannada language string in Google Docs. When I paste it into CKEditor, it shows   in place of a regular space.

Steps to reproduce

1. Create a CKEditor field with options enabled for Bold, Italic and Link.
2. Paste the text from Word Doc to CKEditor.

Expected HTML Output

<p>ಬನ್ನಿ, ಕರ್ನಾಟಕದ ಶ್ರೀಮಂತ ಸಾಂಸ್ಕೃತಿಕ ಮತ್ತು ಸಾಹಿತ್ಯಕ ಪರಂಪರೆಯನ್ನು ಸಂಭ್ರಮಿಸೋಣ!</p>

Actual HTML Output

<p>ಬನ್ನಿ,&nbsp;ಕರ್ನಾಟಕದ&nbsp;ಶ್ರೀಮಂತ&nbsp;ಸಾಂಸ್ಕೃತಿಕ&nbsp;ಮತ್ತು&nbsp;ಸಾಹಿತ್ಯಕ&nbsp;ಪರಂಪರೆಯನ್ನು&nbsp;ಸಂಭ್ರಮಿಸೋಣ!</p>

Additional info

• Craft version: 5.5.8
• PHP version: 8.2.20
• Database driver & version: MySQL 8.0.36
• CKEditor Plugin versions: 4.4.0

Reproduce the issue in a CKEditor field with Bold, Italic, and Link enabled by pasting the linked Kannada text from Google Docs. Compare the generated HTML with the expected output, then trace the paste handling to determine why regular spaces become non-breaking spaces. Done means the pasted text produces regular spaces without breaking the reported formatting.