Very few of my own references include full names, so I guess if I were faced with this, I would use an output style that doesn’t abbreviate the names, and the exact way they are listed, would be output. However, how is the name listed in Pubmed? A quick search showed it indexed as JT not J Th. so what makes you believe it should be Th. ?
Unfortunately, I am forced to use a specific style.
Good question. I assume “Th.” is correct because it is what is printed on the pdf of the article. I believe PubMed is just struggling with formatting as I am.
I am learning that many of the citation data that can be downloaded from journal websites has errors. I trust the PDF.