VimuxRunCommand just echoes (some of) the command into the current buffer

[cszczepaniak]

My setup:

• wezterm in WSL2
• tmux 3.0a
• neovim 0.10.0

When I call :call VimuxRunCommand("echo 'foobar'"), I get o 'foobar' printed where my cursor was in the buffer. If I use vim-test with strategy vimux within a Go test, I get the following printed in my buffer:

ear; echo -e 'go test -run '\''TestSomething$'\'' ./dir'; go test -run 'TestSomething$' ./dir

In both cases, no tmux split is created. How can I debug this further and fix it?