I can try asking @theymos to adjust the image proxy to 3MB, which would even give more freedom. 
That doesn't help. I forgot why you increased the limit from 2.5 MB to 3 MB, but this image should have been 1.4 MB so none of this is a solution.For this issue of changing the MB of images, it doesn't solve it. However, it has already been reported and is being analyzed to be resolved.
Regarding requesting a change in size, it was just to align strategies, nothing more. And in reality it provided another form of image management, but it is not something important.
Either way, there will soon be a correction so that only images up to 2.5MB are allowed.