Per my test, I got the same results when creating list item with Date field using Graph Explorer. In response, the value of the date field displayed incorrectly.
However, when I get the newly created item, the value of the date field would display correctly.
I opened a new issue in github: https://github.com/microsoftgraph/microsoft-graph-docs/issues/13168
Besides, in sharepoint list, the value of the datefield display well on my end.
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