The auto-generated ccmp feature checks for .dotless suffix, and I think it also should check for .dtls which is typically used in math fonts.
The code for ccmp dealing with .dotless uses hard coded list. It needs to know if the dot is above or below (there are two “iTurned” glyphs). Can I just shove the .dtls glyphs into the top group. Or are there some Turned once, too?
.dtls should be all i’s and j’s, so it should be safe to include unconditionally.