HI! I am using English and Persian as my available languages. I am used to use "Win+Space" for switching languages. (using gnome & ubuntu) now with the same OS, but XFCE desktop, using "Win+Space" changes language from English to Persian, but does not work for Persian to English. FYI, I am currently using "Alt+Shift" for switching languages, which works completely fine.
Created attachment 9121 an screesnhot of my current settings
This is most likely the following bug: https://gitlab.freedesktop.org/xkeyboard-config/xkeyboard-config/issues/90
Do the workarounds which are mentioned in the linked report work for you?
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