I second that.
On my end the progress bar is often out-of-sync with the actual length of the posts, so that the progress bar never reaches full length/width/progress even when having scrolled to the bottom (or in some cases so that it reaches its full length/progress a bit too early). And it’s kind of a mystery as to why this is, as all posts should have the same basic structure, but even posts with very similar content and of very similar length (visibly at least) still end up with different progress bar lengths/progress.
Also hoping for a fix, as I love the fact that this progress bar can be attached to another chosen element.
Thanks!