Shadows are pixelated on technical deferred rendering

Android 10, MIUI the shadow like pixelated

HARDWARE
Chipset Qualcomm Snapdragon 720G
CPU Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver)
GPU Adreno 618

When the Shadow bug occurs it will cause severe lag I only get 3-5 FPS only