When adding a custom views handler, I noticed that the error output read "Handler ried to add additional fields to \Drupal\views...." so I traced down the source of the bug to an incorrect sprintf call on line 189(D8)/190(D9) of core/modules/views/src/Plugin/views/field/FieldPluginBase.php. Instead of %s, the call only had %. I have created two patches, one for 8.9.x and one for 9.1.x that fix this issue.
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