Can FSL work with python3？

- Once I installed FSL with python3 (Ubuntu 20.04), erros will appear while using fsl.Eddy. It says segementation fault with code 139. After uninstalling FSL and install FSL based on python2, it can work. Is it normal? Can FSL not work based python3?

- I can only install FSL 5.0 based on python3, also no FSLEYES button apper on its main panel. Is this normal? Thanks.