GraphqlError when querying for issue timelineItems

Querying for issue timeline items (https://developer.github.com/v4/object/issuetimelineitemsconnection/) and getting the following error:

GraphqlError: Something went wrong while executing your query. Please include CBF7:1B645:2577C2F0:2C952C6D:5E1348E0

No filter on types.

Seem to start happen (consistently) after *undoing* a “mark as duplicate” action on an issue (before undoing everything returned as expected).

(also couldn’t find a duplicate undo event in https://developer.github.com/v4/union/issuetimelineitems/, maybe related? am I missing anything?)

Thanks!