plugins – How to remove non breaking space from body/value in migration process?

Migrating from a D7 to D9 site. I am migrating the content successfully however I am getting some extra non breaking space that I’d like to remove: enter image description here

I tried using a basic str_replace plugin but that didn’t seem to work:
enter image description here

Any ideas on where I’m going wrong or tips on what else I could look into?
Thanks!