S2120 TTN decoder works for Chirpstack, Chirpstack decoder does not work in Chirpstack.

As a heads up, I have a chirpstack server that I host, and I found that the decoder for the S2120 on this repo that worked for me was actually the TTN one, not the Chirpstack one. Could be a v4 thing. Dunno. Just wanted to let you know. 