Alt text repeats the text next to it
image-redundant-alt
An image's description says the same thing as the visible text beside it, so a screen reader reads it twice.
Who this affects
Screen reader users, who hear everything duplicated.
Fix it in WordPress
Common in product grids where the product name is both the image alt and the title link underneath. Set the image alt to empty in that template or block.
What the fix is, technically
If the caption or nearby text already describes the image, give the image an empty alt so it is skipped.
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