premiere altering my AE renders to include odd artifcating in the background

We’ve found exporting as Animation Mov from AE fixes this - only appears to be affecting ProRes 4444 Alphas.

Premiere Pro 26.0.1 Build 3

Mac Studio M1 Max 2022 Tahoe 26.2

The edges of Alpha Mov graphics are looking very block/glitchy in Premiere Pro. The really odd thing is that I have two Mac Studios running the same version of Premiere Pro - one does this and the other doesn’t.

The only difference is the Mac that doesn’t do this is running Sequoia 15.6 and not Tahoe 26.2.

After Effects on Tahoe appears to be unaffected by this - just Premiere Pro on Tahoe showing this issue.

I’ve attached a screens

hot of the issue

Yes, it has to do with the composition's background not being black or white. So if you are trying to use a black stroke on a text layer and want to see the thickness by creating a blue, red, or green background comp, you will need to switch the composition's background color to black (#000000)or white (#FFFFFF) before final export.
  The error occurs after saving and closing the Premiere Pro project for any comp you have exported that does not use a black or white background on the final export.
 When you re-open Premiere Pro, the alpha channel has a halo surrounding it that reflects the color of the background used in your AE comp. Even if you change that comp from straight to premultipled, you will still see a thin halo around that file.
I wanted to get more user feedback and see how many are affected by this error. Until we can get a fix, the simple workaround is to use a black or white background in your comp builds of the AE project.
Here to help

Ian

I'm thinking it may be the difference between pre-multiplied or non-mutiplied alpha. I know Premier doesn't always like one but never remember which it is. 

whenever i've reported it are the times i've had the issue. and not beyond that. so i've had it happen maybe twice in the past 2 years if i had to guess. thats the weird part about this glitch, im able to bring in tons to premiere with alpha channels that dont have issues. over a year ago adobe said the issue had to do with having a blue background. not the blue background you might think. like when press Command K and choose a color in that box. 

Hi @rachelcenter 

I still get this issue whenever I export Alphas and bring them into Premiere Pro. I'm checking in to see if you still see the same thing. I am going to try to get this re-evaluated for a fix. I'd like to reopen this ticket with the team.  It will be good to know how you have been doing and if you still see this issue happening. 

Here to help
Ian

I just found a fix, for me it was the "Linear color composition" option, i disabled it and now i'm just fine 😄

Look

I'm on premiere pro and the thing is, when i'm visualizing it inside the video editor and it's not fully rendered yet, it looks just okay but when i render it inside of premiere pro or export it, the images get this weird outline...

your'e gonna have to re-render from scratch to make it go away for now