Those kind of questions get very crowded with answers quickly. It really depends on the dev handling those if your answer stays or gets deleted. Looking over the 4 pages of answers, 29 posts with the status-completed got deleted so I assume that should be the expected action. The other OP's of the 20 status-completed answers should expected deletion as well, maybe triggered by this answer.
I personally don't feel bad or happy about fake internet points. Users that do should keep in mind that voting is on the post (which has no feelings), not on the person. The voting on the bug reports should be considered as a way for the community to signal the priority to the devs, not as a way to indicate the usefulness of the answer.
Having seen this happen a couple of times I think a bit of advice to the dev-team posting those kind of bug report master list:
Please indicate on the question what your procedure will be for posted answers that get a status (like status-completed) so the community doesn't get surprised by the sudden deletion of upvoted answers and the reputations consequences. Maybe suggest posters to make their answer community wiki?