Comment on STT Trap - Options Expiry - NSE BSE MCX-SX

I had a problem today . I had some long 7800 Calls and I squared off 50% quantity by 3:15 Pm. After 3:15 Pm,The scrip has been vanished from my market watch (Nse now mobile app ) and I could not add it again. So the 50% quantity was exercised and had to pay hefty STT.. Infact not only this options , but the Current month futures I was holding also disappeared from market watch after 3:15 PM .

Is it normal that , the F&O segment will stop taking orders after 3:15 PM on expiry date for the current month ?

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