LENOVO IDEAPAD 3 17IIL05 - Upgade RAM past 12GB?

[hardware_failure]

According to page 2 of this spec sheet there is 4GB soldierd to the MB and one open SO-DIMM slot. (DDR4-2666)
https://psref.lenovo.com/syspool/Sys/PDF/IdeaPad/IdeaPad_3_17IIL05/IdeaPad_3_17IIL05_Spec.PDF

Also says max RAM is 12GB, ie placing an 8GB DIMM in the open slot.

Is there actually any reason I cant put in a 16 GB DIMM for a total of 20GB? (I know it wouldnt match for dual channel)

Thanks.