Per comment on Curseforge:

@PingZingy

hi, I just started using this addon. I noticed it is not converting Shield Block Rating enchants on Shields. It seems to show block rating for gear that has it by default, but isn't converting +15 or +10 Shield Block Rating on any of my shields. Is this a known issue? All of the other enchants seem to show properly. Thanks!

Going to punt this to a later point release after 1.13.0, because it's a) minor and b) probably annoying to fix, and c) 1.13.0 is big enough already.