Random thickness of Footnote separator lines

In a Writer document I’m seeing Footnote separator lines of different thickness, seemingly randomly

I have reported this on https://ask.libreoffice.org and received a response that it's a screen glitch.  I don't believe it is as the problem is visible on a printed page.

This is a link to my report and the following conversation
https://ask.libreoffice.org/t/random-thickness-of-footnote-separator-lines/97103

Summary

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My document has three page styles, First Page, Left Page, Right Page

In each style I’ve used Format → Page Style → Footnote to set the footnote line to be 0.1pt thick

However regardless of the Page Style, the footnote separator line will be either the correct thickness, or noticeably thicker, randomly.

It’s also noticeable that as I edit the document the footnote separator line can change from thick to thin and vice versa. I’ve not seen any pattern to this.

I’ve tried unpacking the ODT file to look at the ‘content.xml’ file but I can’t see anything obviously different between when the line is thick and when it is thin.

I export the ODT to PDF and the thick and thin lines in the PDF match the state of the ODT at the time of export.

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Two replies said it was a screen glitch however the problem is still there on a printed page.

    It is identical in the ODT and PDF
    It is random within the document
    It can change during editing
    It is still visible at high magnification (ODT file at 550%, PDF at 400%)
    I’ve printed the PDF and what is on screen is still evident on the printed copy.

So I think it's a bug

Thank you for any help