SENSM 13 is continued from SENSM 12, but other stories have to occur between the story that ends in SENSM 12 and the story that starts in SENSM 13. The only spot for a split is after Jonah tells Peter he’s going to the Savage Land and before Peter goes to the Savage Land.
SPIDER-MAN/PETER BENJAMIN PARKER
…
SENSM 12
*SENSM 13 (1-2:2)
ASM 419
ASM 420
SM:HL 1
SM:HL 2
SM:HL 3
S-M 76
XM 24
S-M 77
S-M 78
DC/M:AA 1
XM 26-FB
HFH 1
*SENSM 13 (2:3-22)
SENSM 14
…