[Bug]: large canvas cropped on upscale

[51M0N3-3XC]

What happened?

I'm not sure if is it a bug or is it correct but if I try to upscale a canvas of, for example, 5120x4096 I get an upscaled image of 8192x6144 but is cropped on the left and on top. I'm a beginner so maybe I'm doing something wrong.
Also, there's a way to select only the area of interest before upscaling?
Thank you very much in advance to anyone who will answer me!

Steps to reproduce the problem

I use Automatic1111 1.6.0rc
on windows 11
nVidia Tesla P40 with 24GB VRAM
realisticVisionV51_v51VAE-inpainting model

What should have happened?

some sort of limitation/incompatibility ?

Commit where the problem happens

bf21c19

What platforms do you use to access openOutpaint?

Windows

What browsers do you use to access the UI ?

Google Chrome

Browser Extensions/Addons

adblock plus
translator
ublock origin

AUTOMATIC1111 webUI Commandline Arguments

--api

Additional information

No response

[zero01101]

disclaimer: apologies for the extended delay, my brain is terrible and you shouldn't expect much from me

confirming buggy output size/dimension occurs at huge resolutions and theoretically shouldn't; i know "infinite" canvas size is mentioned but i really haven't done much in comically large resolutions like that so upscaling to sizes beyond any monitor i could conceive owning isn't something i've tried, but yeah, that shouldn't occur...