Hayo,
We've fixed the timezone issue I think. The sample TIF file you sent us looks like it's XMP was created with Exiftool, not directly by Photoshop (IOW it was a Photoshop TIF modified by Exiftool). Exiftool wrote a mostly unused format of the ISO date-time string which had a sub second appended to the time (e.g. HH:MM:SS.ss). This was throwing PM and it failed to correctly get anything beyond the time (including the time zone).
However we still don't properly restore this sub-second value in the XMP and we hope to fix this anomaly. But PM for the most part reads the Exif tags for capture time sub seconds so hopefully this detail won't adversely affect your workflow. Like I said, no camera and not even Photoshop (I don't think) creates an XMP date-time string in this format. It is an artifact of Exiftool.
Regards,
--dennis