Why does the ALTFP_SINCOS IP not meet the target frequency in my design?

Quartus Edition

Intel® Quartus® Prime Pro Edition

Version Found: 15.1 Version Fixed: 15.1

FPGA Intellectual Property

Floating Point

Floating Point Hardware 2 Combinatorial Intel® FPGA IP

Floating Point Hardware 2 Multi-cycle Intel® FPGA IP

Version Found: 15.1 Version Fixed: 15.1