I had the same issue and this worked for me: -office-tools/support/mathtype-support-notices/support-notices/error-message-in-word-and-powerpoint-for-macos-in-catalina-and-big-sur-caused-by-previous-mathtype-installation.htmlEssentially the idea is to uninstall math type completely with the uninstaller that they provide.
As i test Publisher for my use (technical books), im trireing importing some old project (to test what publisher can do for me right now ). and It seems that Publisher got problems with equasions created in mathtype 6.8 and are exported as .eps (no tiff preview, with tiff preview, with wmf preview)
.wmf (but is not vector file.. corect me if im wrong) and .gif works fine.
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