Backlog Trait Doctoring only giving land types options.

[TheGr8Destroyer]

I cast Trait Doctoring targeting Northern Paladin to change the color word on it but the prompt only gave me the option to change land types to other land types.
See Match # 260263215 - Game # 844264894

 

[VaevictusJura]

I had the same exact issue. There are no color options on the card and I wasn't able to select any of my creatures to cipher the spell onto.