How to make a tie bar look correct in PowerPoint?

In Microsoft Word, the digraph t͡s (using the Unicode character Combining Double Inverted Breve in the Combining Diacritical Marks block) is displayed correctly:

ts with a tie bar directly above

In PowerPoint, the same text is formatted incorrectly:

ts with a tie bar placed to the right of the t

Is there any way to override this behavior, or would a messy screenshot/text box solution be the only way?