Like you see in the video, the death screen isn't rendering correctly or doesn't update right (this only affect mobs, not particles or items like you can see)
I guess the best way to solve this is probably stop rendering anything when the death screen is open (else you can see things you are maybe not supposed to see)
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It's been over a year since the question was asked, please respond to the question or attach the files requests and keep the ticket updated.
In 21w11a the death screen stops to update completely (instead of only updating partially as described by this report).
I will therefore resolve this as Cannot Reproduce since the current behavior might be intended.
Please let us know if you still seeing that the death screen updates partially (similar to what is seen in
[media]) in the latest versions.
Does this issue still affect the 1.9 update?