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ADMIN EDIT

A sample reproducible is attached.

The issue stems from the inability of the System.Text.Json serializer to work with fields of type "Type" and the filter descriptors have such a field to denote the type of the column. Whether it will be possible for the grid to work around needs to be researched in more detail, because the limitation comes from the framework.

Might be the same problem as the following thread that also offers a few workarounds one can consider: https://feedback.telerik.com/blazor/1505237-set-deserialized-grid-state-in-onstateinit-handler-cause-error-on-open-filter-menu-of-column-on-ui

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