Can you please confirm if you are seeing the Release Notes screen and receiving the 404 page when cancelling it?
The reason why I'm asking is because of this bug that might be related. Can you confirm that?
Hope it helps!
In case you haven't found the root cause yet, this is a bug slightly different from the one quoted by Andre. You may want to watch the following 2 tickets (Duplicate of each other) for future updates. They contain several workarounds as well:
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