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External Display 2K 144Hz issue

I'm using BenQ EX2780Q (native 2560x1440 144Hz) with M1 macbook pro 16gb. Tried USB-C to USB-C, USB-C to DP1.4, USB-C to HDMI 2.0 (all cables certified for 8K), at best getting 2560x1440 (low res) at 60Hz. OS is Big Sur 11.3 Beta 3, issue still persisted. Quite frustrated.
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