Can you provide a test snippet?
You can compare the differences between the two versions here:

As you can see in the comparison the new version does not allow
document.documentElement to be returned as the offsetParent
and the old one did. I suspect that is whats causing you problems.
All other browsers return document.body and never (that I have seen)
document.documentElement, so this is making it consistent.
When you provide a snippet I can properly see if this is the case.

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