Ij.sc isn't included in c2sc smcp automatic code

Version 2.5b (1125)
I have /ij.sc /ij /IJ, but it’s not in the fea code.

This character is not in use. Consider i_j.loclNLD etc. There is a paragraph in the tutorial about it:

For what it’s worth, Unicode actually knows U+0132 LATIN CAPITAL LIGATURE IJ and U+0133 LATIN SMALL LIGATURE IJ, but they are mere compatibility characters. That means that they are there only for backwards compatibility reasons and their use is discouraged. What’s more, there is no keyboard out there that has an IJ key, and no wide-spread keyboard layout that would produce Unicode U+0132 or U+0133. So we can safely forget about that again.