Currently in Illustrator 25.4.1 Transparency Mask is not working
Currently in Illustrator 25.4.1 when using Transparency Mask the mask is not showing as opaque, it seems to show a tint of the element being masked.
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Most probably the black object in a mask has a black fill set in Grayscale, set by K value, while the document is in RGB mode. 100%K is not not equal to RGB0,0,0. This is a pretty common issue, since Ai uses K in RGB, especially in the default gradient. Changing the fill to RGB in Color panel can fix that. Please comment back if it helps.
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Are you in RGB mode and using a black as a 100% tint of gray? If yes, change the color to RGB instead. If no — please provide a file to test.