Actually don't know if you'd even consider it a bug but..
When you hold the power button, and you press the reboot option, it gives you 3 choices: normal reboot, boot to recovery, or boot into bootloader. The first two options work; the bootloader option however just does a normal reboot.
I can still get to the bootloader by turning phone off, then pressing power and up on the d-pad, but not using CM's reboot setting. I just noticed this when flashing an sbf to change my boot logo.