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There are two issues at hand here: the possibility of the cut closing up due to the weight of the material above it and the possibility of the top portion of the sheet falling off the saw once the cut is completed.
Some manufacturers provide wedges for the operator to insert into the cut as it is made, to stop it closing up. They are in fact redundant.
As the cut is made, the remaining uncut material holds the cut open, until the cut is nearly complete. As the cut nears completion, the part of the cut furthest from the head may close, but the length of cut and the narrowness of the blade make for a very fine angle and the cut immediately behind the blade is prevented from closing by the riving knife.
Once the cut is complete the top piece of the cut sheet does not fall off the machine. If the base plate of the saw head is snug against the material surface, then once the cut is complete the head itself holds the top piece of the cut sheet against the machine, and of course the lower piece of the sheet supports it.
Even when there is a gap between the saw head and the sheet, experience has shown that the top piece is still supported by the lower, and does not fall off.
