It looks like who ever did the framing just saved a ceiling joist and used 2X4s to stabilize the wall and have a place for a sheet rock nailer. If a joist were to sit dead on top of the wall there would be no need of it to be there as the wall would serve to tie the two walls together and since no sheet rock could be nailed to it, it would be useless, unless it were a two story then it would need to be there for a floor joist.
Now you will need to remove the 2X4s and install a ceiling joist as it will have sheet rock nailed to it.
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