Static Timing Analysis applies a concept called Time Borrowing for latch based designs.
This blog post explains time-borrowing, and is relevant to cases where your design has latches, and your timing report has time-borrowing.

Let us consider a clock of period 10, with a duty-cycle of 50%

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I didn't find the right solution from the internet.
References:
- https://forums.xilinx.com/t5/Technical-Blog/Time-Borrowing-in-Latches/ba-p/651529
- 3D Animation Agency