Moving a part of a blend with any Selection tool makes it move faster than expected
In 29.7.1 (and Beta 29.9.0.6) when I move one object in a blend with any selection tool, inside or outside of isolation, it moves twice as much.
This is similar to this problem with symbols — http://illustrator.uservoice.com/forums/601447/suggestions/50293512

The team is able to reproduce it and is going to make a fix
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Margaret Trauth commented
I'm just gonna add a note here that this only happens when real-time preview is on, which feels like something potentially really helpful in narrowing down where to look for the problem!
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Sean Grady commented
I originally reported this on the forum and a post. Originally, I though this was due to snapping. If you're searching for "Blend Object" and "Snapping Randomly", then hopefully, you'll find this post!
Thanks Margaret. :)
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Margaret Trauth commented
Good morning, here is some extremely unexpected behavior when editing a blend with real-time preview on. History is absolutely spammed with 'undo' operations while you're moving a sub-object of the blend, and when you let go, it moves twice as far as you dragged it.
More details in the attached file, original report is at https://www.reddit.com/r/AdobeIllustrator/comments/1nia2zk/blend_wont_let_me_move_objects_where_it_should/
- reported on 28.9.1 on Windows 10, I repro'd it on 28.9.1 on Sonoma.
As a further note, although my repro file doesn't have a spine for the blend, this does *not* happen if you drag around the blend spline with real-time preview on. You also don't get a real-time preview of the changes, curiously enough.