I uninstalled, redownloaded the apk from the first post in this thread and reinstalled. When opening the game, I first allow the screen overlay, then start playing the game without opening the mod menu at all.
I get the intro scene, then break the first block, get two coins and buy the first tap upgrade. This does not reduce my coins, it keeps showing I have two. Breaking more blocks after this does not increase the amount of coins I have and I cannot buy any other upgrades.
Closing the game and reopening it causes the gold amount to be set to some ridiculously high number, but I can still not buy anything in the store.
If I reinstall and activate the mod before I start playing and make sure to save those settings for the next time it works perfectly, until I turn the unlimited gold mode off again.