I have exactly this problem, but unfortunately using twentyten 3.1 breaks my posts pages by failing to display a banner image. So I’ve been using twentyten 3.0 – the very old version.
Plus I can’t see an easy way to downgrade WordPress 5.5 as the Dashboard has more or less disappeared.
Obviously there is some difference in the releases of twentyten but might take a while to trawl through to spot them.
Please don’t suggest using a different Theme, it is actually a child theme of another we use on several sites with great success.