I had lots of occurances of websites, including my health insurance, where the header would display the old name and the rest the new. 
My favorite is my Yahoo! accounts, which I only use for Fantasy Sports, where my deadname appears on random pages.
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Then eventually 6 months or 12 months later would fix themselves.
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Microsoft office also deadnamed me until I did a deadname search and destroy in the registry.
End of conversation
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