This is an edge case noted in testing. When the host container supports writing, but does not reading of cookies, both read and write functionality will work.
Write without read support is an uncommon scenario.
I have come up with no scenarios where the ad would be able to write a cookie, but not able to read the value just written.
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I have come up with no scenarios where the ad would be able to write a cookie, but not able to read the value just written.