I thought this forum has the most knowledgable RTW'ers, so forgive me
for posting here.

I am trying to take advantage of the very low SQ only RTW fare ( approx
USD 7000 in First).

Starting/finishing in North America, and my needed stops are in:
ICN, TPE,PVG and/or HGH, BKK, and CGK.

So I tried the following SQ flights for the RTW ticket:
LAX-NRT
open Jaw
PVG-SIN-CGK
CGK-SIN-BKK
BKK-SIN-FRA
FRA-JFK

with NRT-TPE-PVG on separate ticket

I was told that the SQ RTW does not allow backtracking, and multiple
transits in SIN contitute back-tracking.

SQ rating desk said to buy a separate ticket SIN-CGK-SIN-BKK-SIN,
which together with the other separate ticket noted above makes it
much more expensive than the Star RTW fare, never mind the SQ only.
As far as I can see, there is no
way to make 2,3,or 4 stops in Asia without transiting SIN multiple times.

Under the old ( pre Star Alliance) RTW rules, BKK-SIN-FRA was never
considered back-tracking, and was always permitted as part of a RTW.
Why is it different now?
Any other suggestions?