I’ve same issue, no overlay.
Chimera on ios 12.2 iPhone8
everything is installed ok through Sileo, but no overlay in games. Ive used PvZ2 for my testing, tried the above workaround by first doing respring just to be sure, then after the game was started deselect and select all and started game again no luck, tried several times always by removing the game from multitasking - no joy
Since may people with different ios versions seems to have the same issue, would it be possible to release a debug version so that we can understand what fails?