One Bizarre Chinese Coin Overstruck On Another Chinese

On my conquest on finding bizarre overstruck coins, this is one really odd one that I have never come across:



Shensi 2 cents overstruck on Honan 20 cash.

This alone throws a lot of confusion over how Chinese cash coins of various provinces work. Was the Honan 20 cash coin worthless enough to be struck over as Shensi's 2 cents or this was some mint employer messing around? Note during this period of time, it was common for a lot of the Chinese mint to import Korean 5 mun coins to be overstruck as 10 cash coins but this comes as a total surprise. Please kindly let me know if you have come across another example of this kind of overstrike.