When you copy all items in premiere and then paste it into a new composition in After Effects.
Don't do that. Select the clips in PP, right click and choose replace with After Effects Composition...
See if that helps.
Tried also, doing exactly what copy and paste is doing.
Keep the clips the proper speed in PP, and adjust that as needed in AE instead.
Yes thats a workaround but not a real solution since premiere is an edit application where you need to see everthing as a whole. For my edit proper speed is the reverse speed.