Unable to place spaces in Hookpad/Theorypad names

Today, I’m working on a piece with spaces with it’s name. When I opened a tab from yesterday and saved it, it was fine with the spaces.

Did something go wrong?

EDIT: And it is happening now even though I just transferred a tab onto Theorytab with spaces in the title.
EDIT: It’s really wonky. I’m trying the string “LifeGuidingSong ProspectMiraiVerse” and it is not valid somehow.