I think that might be a GT issue. From what the patch notes say:
Doesn’t say anything about the lvl 70+ versions being removed, yet for some reason GT only offers the lvl 50 version of the prefix.
Also, if you’re trying to compare builds between versions 1.2 and 9.8, add “-1198” behind the word “calc” in the link, and it will switch it to version 9.8 while retaining the build. If you do it from the top bar it will show a blank character, like you said.