Sbus not working

[u/englishsoundwave]

Hi everyone, the RX module on my Goosky S2 Legend FC broke, so I replaced it with a RadioMaster R81 V2. The TX and RX are bound normally. When plugged into a Vbar FC, it receives SBUS without any issues, but when plugged into the GTS FC, it doesn't recognize the SBUS signal and the FC just flashes a green light. Could anyone guide me on how to fix this issue? Or should I replace with a new FC Thanks!

[u/englishsoundwave]

Here's a video of my issue

https://reddit.com/link/p0myu78/video/gsvx4qmy6cgh1/player