@Paul Uu Thanks for checking into this - I'll send you a message with some example EXR sequences with the issue.
One weird thing is that I'm only seeing the issue with existing EXR sequences. I haven't been able to reproduce the issue with new EXR renders so far. I thought it was a cache issue because of that, but clearing all cache doesn't seem to make a difference.
I've only seen this happen on my local system. I haven't tested with footage across a network.
This is not something we observed in our internal testing, nor have we had any other reports of it, but it is definitely a serious issue we want to resolve ASAP.
By far the quickest way we can do so if you can message me a link to the simplest AE project with EXR source footage that is reproducing the issue for you.
Also, are you working with the footage across a network connection, or is this also occurring with the footage on your local system?