Yes, since the metadata is contained in every IDR, it can change frequently. I believe the Blu-ray spec doesn't allow for the static metadata to change during the main title, but that's not something that is or could be technically enforced.
How a display deals with unexpectedly changing static metadata is another question entirely. I wouldn't be surprised to see some pathological behavior in some.
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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