4:3 Resolution Options Not Scaling FOV Properly

I usually play on 16:9, 2560x1440 but wanted to try 4:3 out, using 1920x1440. I noticed that when you change the resolution to the 4:3 option, the game asks "would you like to keep these settings", and the FOV is accurate only during this 15 second screen. Pressing "Yes", sets your FOV back to what you were using before. This doesn't change the actual FOV value, but it visually changes the FOV instead. Below are examples. Notice the small gaps I have on the sides to illustrate the FOV changes.

2560x1440 @ 105 FOV:

1920x1440 @ 105 FOV (notice how I can see less to my peripheral, as intended with 4:3 aspect ratio)

After hitting "Keep", still 1920x1440 @ 105 FOV (notice the gaps are back)

Anyone figure out what is causing this? I made sure my display scaling is set to Aspect Ratio, so it is stretching the game properly at less-than-max resolutions.

I tested this in an actual match, same results. Changing from 1920x1440 back to 2560x1440 also fails to apply the proper peripherals. The user interface is scaling properly which means the resolution is actually changing too. This seems to purely be a FOV issue.

1920x1440 @ 105 FOV:

2560x1440 @105 FOV before hitting Yes, Keep:

2560x1440 @ 105 FOV after hitting Keep:

UB-capSAR​ it looks like the game isn't saving the 1920x1440 resolution and is switching back to 2560x1440 resolution.

You can verify if this is the case by being up your monitors on-screen menu and checking the current monitor resolution.

I have also noticed this after testing it a few times 

Is there a fix for this? Thank you in advance 

I'll try this later tonight, but from what I can tell the game gets fuzzier, meaning the resolution is dropping like it should.

im also having the same issue, going crazy trying to find a way to properly stretch the game, playing on 4:3 doesnt stretch the game at all, quite the contrary, it keep the same horizontal fov and gives you MORE vertical fov for some reason, making the enemys look squished and even farther away. hoping someone find a fix for this. 

Still no answer to this. I have tried almost everything I can think of, tried getting an answer from devs on X but it all gets ignored. People keep saying "Just change your fov" which is COMPLETELY wrong. 

Any solution found ?

My native resolution is the same as yours OP, so I just tested it to see if it's a bug/universal problem, but it worked fine for me. 
What I did;

Created custom resolution in Nvidia Control Panel (1920x1440, 170hz)
Set Scaling Mode at "Full-Screen" (GPU) - did not check the box "override the scaling set by games.."
Ingame I chose; 4:3, 1920x1440 and Fullscreen.

yeah the Resolution Drops but does it stretch??