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Dev they are not make their work at all, they just give us candys with some updates but they never fix major issues.
the only solution for have fast and lesser issue with your phone is to be on beta 9.4.18 or 9.4.26, and for have again 0 issue and with touch is to go more more back to Oreo Rom.
From When we change to Pie , Developer lose the fight every week/month with technology 6+ month now they are just destroy the name of Xiaomi totally
its very shame .... and i hope to change way they work... but personal i have lose my faith on Xiaomi after 6 months journey with feedbacks and 0 fixes only more issues