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First, use TYSL with option 0 to use actual voltage vector as starting point.
Regarding your conclusion:
1) BUSDAT returns the actual voltage for a bus, also after conversion to "switching studies".
2) There is nothing weird with TYSL. It is expected that the voltage may be changed at all buses in the interconnected AC system when performing a switching study. Your buses are in the same AC system. There are no PV-buses or swing buses in the network after converting the generators. No buses have voltage control.
