Floaterm runner not work, it just display like splited terminal window

[Stark-X]

Using command :AsyncRun -mode=term -pos=floaterm -position=bottomright -width=0.4 echo 123\\n456 on vim:

Using command :AsyncRun -mode=term -pos=floaterm -position=bottomright -width=0.4 echo 123\\n456 on neovim: