flooring bug

Please help, I'm on sdv mobile and I just started modding on mobile and my floors keep going void, this has never been an issue on my pc and normally I would play on my pc but it's currently on its last leg and I don't wanna pay an arm and a leg to fix it right now. When I exit my game because...

In my backwoods, have flooring (stone walkway floor) covering most of area. Artifact spot spawned in middle of flooring, and unable to pickaxe flooring to access artifact spot, and unable to hoe artifact spot, so artifact spot remains stuck in flooring, and one tile of flooring cannot be...