I have the exact same issue on my Pixel 4a. Tried a bunch of stuff, even installing their gallery app (with network and everything in XPrivacyLua blocked), to no avail. It just crashes when using the shortcut.
My “solution” was to place a shortcut to the normal gallery app on the home screen and train myself to quickly switch to it.
I no longer remember details, but it was something to do with HeliBoard’s dictionary and the system one. Have you checked they both have the right languages?