In former versions of Jmol, the cartoon for nucleic acids had "sidechain" 
sticks coming out from the midpoint between phosphorus atoms towards the 
base.
11.0.RC3 (likely started before this) draws the sticks from the phosphorus 
itself. I have no objection to that, but the wrong phosphorus is being 
associated, which belongs to the neighbour residue.

For ex., on 140d.pdb, base in [G]20:B in linked to phosphorus in [C]21:B

As a consequence:

3'-terminal P is associated to two bases

5'-terminal P is associated to no bases (and, if the 5'-residue has no P as in 
140d, the residue is colored red instead of orange). The 5'-terminal base is 
not drawn as cartoon.

This seems general, it happens in other molecules such as 255d.pdb, 
5tra.pdb, 2zna.pdb

To see it better, use
select all; cartoon on; spacefill off; select _P; spacefill 50%; select all



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