Progress bar shows progress only for last file when set to unlimited (with exceptions)

During upload, progress is only shown in the last progress bar when the field is set to unlimited "number of values" (files).

For example, If three upload file input-fields are shown, and I click Upload on the 1st, then click Upload on the 2nd, etc... I observe that only the last file's bar shows progress. The others say "Starting upload" throughout the upload. I know they're uploading because I'm watching the /tmp directory with #> watch -n1 'ls -l /tmp' and see the temp files appear and grow.

I am able to find exceptions. For example, say my node has six files already uploaded. I edit the node and remove the first three. I now have three empty input-fields followed by three files. I can now browse to any/all of the first three and click their corresponding Upload buttons, in any order. All 3 progress bars work and show progress.

But if I then click Add-another (remember, there will already be an open input-filed at the bottom) now making two open input-fields at the bottom, then old the last one will show progress (whether simultaneous or one at a time).

Also, if I edit the content-type's field, and change it to some number 1-10, then progress bars work fine in all the combination I've tried.

I see this with FF3 and IE7.

I realize that the progress bar is a very new addition, but I eager to help by testing!