[BUG] DataModel warns about being registered multiple times

[philippjfr]

Every time I display anything all the DataModels I have defined complain that they were already registered. Either they are sent and serialized each time or something is causing them to be re-registered each time. In any case I see tons of these warnings:

[bryevdv]

is this a dupe of #11026?

[mattpap]

No, this is duplication in the other direction.

[github-actions]

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