possible clock domain crossing?
This looks like a 54 MHz circuit, since you have no obvious control of the phasing of the two clocks. So long as the two clocks are synchronous, and all of the clk_27 to clk_54 paths are timed for 54 MHz, then there should be no issues with metastability or convergence.

If any of the signals are generated by different clock sources (even if they are phase locked), or pass off-chip through external connections, you will need to allow for the worst-case delay variation there too.