Two sequences with the same source layer in a project cannot properly have different frame blending on that source
- Create a sequence in a project ("source")
- Create another sequence ("wrapper") which imports the first, then time warp it to be a bit slower. Leave the Frame Blending at "none"
- Copy/Paste the wrapper, then in only one of the wrappers, change the source Frame Blending to "Pixel Motion".
Expected: AE preview frames, and renders via Premiere Pro import, both respect each sequence's respective frame blending options.
Actual: Only one of them is actually respected for both sequences. Which one is used is pretty arbitrary, depends on what AE is using to render the frames. Once the user fiddles with things enough for AE to discard preview frames, it might switch to the other blending method instead.
This problem affects not just previews in AE or previews in Premiere Pro, but final renders created from Premiere Pro as well. As a work-around I will try to duplicate the AE project and only have one blending mode in each of them, hopefully it will not try to "share" the previews/renders since they will be unrelated projects.

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Jordan Mecikalski commented
Greeting John, apologies for taking almost 2 months to respond. I finished a very large project and didn't even want to LOOK at After Effects for a little while... no offense!
Attached is a minimal reproduction of the issue. You will find shape layers with titles explaining the issue. To make the issue as exaggerated as possible, this project uses a JPEG sequence with text in the JPEGs as its video source, which really makes it obvious which frame blending mode is being rendered.
EDIT: Well I feel like I gave it enough time, but in spite of getting no error message, I guess three and a half megs is too much for UserVoice. Here's a Google Drive link: https://drive.google.com/file/d/1SwWqFdYbl_9jxLltihxufE9ANkq8KIEJ/view?usp=sharing
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Hi Jordan,
Thanks for making this report. Would you be able to share either a project with the setup you've described or a screen recording of the issue? In trying to reproduce it, I've found I'm unable to follow your steps as I understand them, but perhaps I'm misunderstanding the terms as they're being used.
Could you describe more about what type of "time warp" you are applying in step 2 and which item is being warped? For instance, are you referring to the Time Warp effect, Time Remapping, or Time Stretch?
Thank you for any further information you can offer,
- John, After Effects Engineering Team -
Jordan Mecikalski commented
Had to step away from the project for a bit but the problem did indeed go away when I saved a copy of the AE project. In the original I had to switch the frame blending and then switch it back to force it to use the correct blending, but with that sorted I had no issue keeping one frame blending consistently active in one project and another frame blending consistently active in another project. I imported both sequences to a single Premiere Pro project and they both previewed and rendered according to their respecting blending options.
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Jordan Mecikalski commented
@Antoine yes, but that's kind of irrelevant. I just added the Premiere Pro part to demonstrate how big the issue is. The primary concern is that it doesn't preview correctly even within After Effects.
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Antoine Autokroma.com (Independent Developer of AfterCodecs, BRAW Studio, PlumePack, Influx) commented
Are you importing the AE project into Premiere Pro with dynamic link ?