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I think the problem is on the proprietary driver that Waveshare uses for this display, try to use open source one:
Remove the Waveshare dtoverlay and add this lines on your config.txt, reboot to see if it works.
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-waveshare-panel,2_8_inch
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