Nifty Strike format??

XS8910
https://kite.zerodha.com/chart/ext/ciq/NFO-OPT/NIFTY20O0811450CE/9621506
"NIFTY20O0811450CE"

"NIFTY20O"--- I see after 20"O" is there....it was not like this till last month.....for next month all week expiry symbols are changed like this.....my algo will fail.....please check

symbol for format changed ???
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