Unable to save widgets dialog after upgrade to 5.6

When I go Appearance->Widgets and make any changes and click the Update button, it changes to “saving…” but never finishes.

I’m using the Twenty Twenty theme.

I’ve tried removing all the widgets and re-adding them.

I’ve updated all plugins to the latest available versions.

The only thing I haven’t tried is upgrading PHP7.3 to 7.4 on my host, which I haven’t tried yet since my Debian Buster release is all up-to-date, and that includes sticking to PHP7.3.

What can I do?

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