Unable to delete non-existing titles from my PTW list

There are dramas that no longer has a place on MDL for some reasons, such as Absolute Him and You're Fatefully, so as I was cleaning and re-organizing my PTW (thanks to the priority system) I found out that I'm not able to delete those from my list because they no longer exist, so it's some kind of paradox, I believe.

I don't know if this used to happen before, I never tried deleting them before.