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I am also experiencing the same issue in tableau public.
I said back but something strange to report...
Just published a workbook (with map), and my marks are showing as a very very light grey/ white ,and if they did show, the colour has been swapped for unknown reasons?!
Desktop on left, Public on right, mirrored site also reflects Public.
I then interacted with the map (just once, accidentally zoomed) and the marks appeared, and the colors swapped back to normal.
Refresh my mirrored website, and the change is shown?!
Refreshed in Desktop and republished, initially the view was OK for 1 second then as before, the colored marks went grey and colors swapped.
Zooming trick (to reverse) works again.