Cannot insert symbols from instantassist

[XeroOl]

Using instantassist's <Super+A>kk keybinding appears inconsistent. Most of the time, it fails to insert into the terminal.
The terminal supports unicode characters, and can recieve them via copy/paste, but not with instantassist.

This appears to be caused by xdotool's interaction with st.

For example, if you run the following code in the terminal:

xdotool type aaππaa

Note that the output is only aaaa, without the symbols.