The suffixes section accounts for this. Wolfing and wolfish both suppress the ligature correctly.

I removed the comma separators, good catch. No difference, though.

Looks like I edited /opt/context/tex/texmf-context/tex/context/patterns/mkxl/lang-en.llg instead of the LMTX file. SMH.

I've now tried both files, lmtx and mkxl:

            suffixes = [[
                in
                in'
                in’
                ing
            ]],

Wolfish works fine, the ligature is suppressed as expected. Wolfing, wolfin, and wolfin' aren't suppressed. I'd have thought that defining the word "wolf" with a suffix of "ing" (and variations thereof) would suppress ligatures at the suffix boundary?

Maybe that's not the case. If so, then it means having to define all the *f-ing words (heh) a few times for the different suffixes (in', in’, and ing), which seems to defeat the purpose of separating suffixes?

Help is appreciated.