Two of the same half blocks (for example 2 half quartz blocks) can be placed to form one block, but two different half blocks (like a half stone and half quartz) won't stack, they act like regular blocks and leave a gap.
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Duplicate of MC-5157 - If you have not , please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
this is natural.....it has always been like this