Achieving true 21-9 aspect ratio

I’ve noticed that UE4 doesn’t officially support 21:9 aspect ratio and therefore I decided to do some testings.

At first, I’ve tested Sensor Width 21mm and Sensor Height 9 mm, but that gave me the black bars on the side (which does not fully represents 21:9 ratio)

So I decided to modify Sensor Width to fit the whole screen, set to 21,25 mm.
It worked in viewport perfectly fine but once I render It you could notice a small stretching.

I rendered via Level Sequencer and set resolution to 2560x1080 , which coresponds to 21:9 aspect ratio.

Does anyone else encountered this strange issue?

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