Low Reflectance Values on images corrected with sen2cor

Hello! I’ve downloaded 2 different Sentinel 2 products:

L1C (no BOA correction)
L2A (BOA correction performed by ESA)

I’ve noticed that after the sen2cor correction on the L1C product the reflectance on every pixel was much lower than the usual value. That also happened in the L2A product.

The reflectance values on the B05 are around 5% on any vegetation areas. I’ve searched for some papers which used sen2cor correction to see if there was any ‘Surface Reflectance x Wavelenght on vegetation areas’ plot but couldn’t find any, so I’m coming here for help.

Are those values normal? Do you know any papers that can guide me to understand this better?

Thank you!