I currently have "the tower" Xur bounty/Invitation of the Nine and I found online that the issue with Vex kills in the Tangled Shore was fixed, so I completed the rest of the steps but the bounty still shows as not complete.
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The issue causing Vex on Tangled Shore to not drop the samples was fixed. You can find Vex on the Tangled Shore in the Warden of Nothing strike (as TuxyDoh stated below). You still have to get the samples.
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It does not auto complete until you kill the vex
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It was slated to “auto complete”. We still have to complete the 4 requirements within the invitation.