The exo 0.11.5 version of helpers/google-chrome.desktop does only contain google-chrome for binaries field. Add google-chrome-stable as well.
Sean Davis referenced this bugreport in commit f294eba34b27bfbd2550bfa3ff6ce8cc48399e87 Add google-chrome-stable binary for the google-chrome helper (Bug #13876) https://git.xfce.org/xfce/exo/commit?id=f294eba34b27bfbd2550bfa3ff6ce8cc48399e87
Good catch, applied above.