Ghost Text suggestion (unless already possible)

Recently had an issue, sorted by @Eva, thanks again, where two spaces in my document, in the middle of a chapter, had somehow been marked as Ghost Text.

They looked no different to any other spaces and I had a bad ebook and pdf file as a result, because you can’t see the difference, even with ‘Show Invisible Elements’ turned on.

Suggestion: Can SPACES in Ghost Text be marked up in some way, so they show in the document when something has happened like this? Either permanently, by changing the background, or when SIE is turned on, by changing the background.

I would never have found the problem without your help, and I can’t be the only one who would not know what the issue was since they are both ‘invisible’ and not revealed by SIE.