All the maps created BEFORE and AFTER the 'Mansion Update' are still ok BUT the maps made during the 'Mansion Update' are now blank.
I also had a lot of maps showing the locations of many different Mansions (those bought from the cartographers) and none can be read... they're all blank.
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Who ever said it wasn't opened in other 1.16 Snapshots? It was. This problem appeared when I loaded your snapshot from about 3 weeks ago I think (the one before the 'Pre-release).
But no mods were ever used. Never any mods. I confirm
Please be absolutely certain that this world was not opened in any other 1.16 snapshot or Pre-release other than 1.16 Pre-release 4, and that no mods such as Fabric were ever used.