This happened to my friends and I after the third wave as well. We all stayed in range the whole fight and when complete we didn't receive a new check point. We searched everywhere for a remaining enemy, nothing. We tried everything. In the end we had to restart. Quite irritating indeed.
English
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Did you try redeploying the ghost at door?... that's what happen for me, (don't know why it was resetting D: )
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Too far away when the last enemy was killed.
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If that had happened then it would tell you to breach the hatch again
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Sometimes it does. A couple of times we had to orbit