Well, it is not based on residue numbering.

A possible way to deal with this ould be to parse the pdb information 
in LINK records. 
Henry's file (2HK4.pdb)  has them:
LINK         P     C A   1                 O3*   T A   8              
LINK         P     C B   1                 O3*   T B   8              

They are meant to supplement info in CONECT records, and to be used 
for:
1. Bonds between HET groups or between a HET group and standard 
residue,
2. Inter-residue linkages not implied by the primary structure
3. etc.

Point 2 looks to me like the current case. Point 1 would also be 
interesting (not sure now whether Jmol currently links hetgroups and 
residues in cartoons, will check)

This is the PDB spec:
··························
The LINK records specify connectivity between residues that is not 
implied by the primary structure. Connectivity is expressed in terms 
of the atom names. 
[snip]

Record Format

COLUMNS         DATA TYPE      FIELD           DEFINITION
---------------------------------------------------------------------
 1 -  6         Record name    "LINK  "
13 - 16         Atom           name1           Atom name.
17              Character      altLoc1         Alternate location 
indicator.
18 - 20         Residue name   resName1        Residue  name.
22              Character      chainID1        Chain identifier.
23 - 26         Integer        resSeq1         Residue sequence 
number.
27              AChar          iCode1          Insertion code.
43 - 46         Atom           name2           Atom name.
47              Character      altLoc2         Alternate location 
indicator.
48 - 50         Residue name   resName2        Residue name.
52              Character      chainID2        Chain identifier.
53 - 56         Integer        resSeq2         Residue sequence 
number.
57              AChar          iCode2          Insertion code.
60 - 65         SymOP          sym1            Symmetry operator atom 
1.
67 - 72         SymOP          sym2            Symmetry operator atom 
2.
74 - 78         Real(5.2)      Length          Link distance

··························

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