Definitely don't look at the closing yield at the top, look under Auction Results.
And when I mouseover the "i"s i see this:
Cut-off Yield - calculated based on the clean price
Cut-off Price - includes accrued interest (i.e. dirty price)
3.56% p.a. and 93.869 - so the cut-off yield is clean but the cut-off price is dirty
The cut-off price is what you would actually pay for the bond (i.e. get a refund of 6.131 per 100). The cut-off yield is like for you to understand what your money is yielding.
In the SGS bond calculator, I choose N520100A, settlement date 4 Sep 2023 and price 93.69, because this input is for clean price. It computes accrued interest as 1.70 and dirty price as hence $93.69 + $0.17 = $93.86. This roughly matches the Auction Result's 93.869 which is the dirty price.
https://www.mas.gov.sg/bonds-and-bi...ore-government-securities/sgs-bond-calculator