Edit Metadata Comments remove formatting doesn't save

[toomuchreading]

In previous versions of Calibre, when I edited metadata, I remove formatting from the comments, especially if there are extra spaces between each line making the comments double spaced and twice as long. What I usually would do is use the "Select All" button, then the "Remove Formatting" button. This would then remove all the extra line spacing. Clicking on OK would then save the changes.
When I do this now, the changes are displayed on the edit metadata screen like I expected, but after I press OK, the changes to the comments are not saved. If I type any changes, those are saved and if I bold something that's removed. It just seems to be spacing between the hard return that is not being removed.
I have included 3 screenshots. The first is before any changes. The second is after the select all, and remove formatting button have been pressed. This is what I expect to be displayed and saved. The third picture is of the book in the Book Details view. If I go back into edit metadata for the book, It's like I haven't done anything.

[BetterRed]

Windows 10.0.19045.6937 — Calibre: 9.3.1 — Standard Install

Works for me on a couple of books, maybe there's something weird in the mark up - post it here so that the HTML coders can have a look.

BR

[toomuchreading]

This is the HTML window from the example in my first post...

[BetterRed]

That's as vanilla as one can get. I think we need to see what you have in Preferences->Look & feel->Book Details->Text Styling, this is what I have:

body, td {
    background-color: transparent;;
}

body.horizontal table td.title { white-space: nowrap }


p { margin: 0} 

a {
    text-decoration: none;
}

.comments {
    margin-top: 0;
    padding-top: 0;
    text-indent: 0
}

.comments-heading {
    font-size: larger;
    font-weight: bold
}

table.fields {
    margin-bottom: 0;
    padding-bottom: 0;
}

table.fields td {
    vertical-align: top
}

table.fields td.title {
    font-weight: bold
}

.series_name {
    font-style: italic
}
.#country{font-color: green}

BR