The Android version on itch is updated. I downloaded it again just now, started a new game, and the Flowchart appears normally for me.
If the backpack icon is visible but the Flowchart icon is missing, please check Preferences and make sure the Flowchart icon is enabled. Also, please confirm that the main menu says version 0.2.2 and that you downloaded the APK directly from itch, not from a third-party mirror.
If all of that is correct and it happens even when you start a new game, I'd need your save file to check the variables state.