Not sure if this is already fixed in 4.16, since I’m using UE 4.15.3.
As shown in the pictures below this only affects TextureObjectParameter and not the TextureObject node.
Here its connected directly to a Texture Sample:
https://s11.postimg.org/hcni5564z/screenshot_2017-06-01_22-08-54.png
Here its connected to a reroute node first and then to a Texture Sample:
https://s11.postimg.org/9imwjqyc3/screenshot_2017-06-01_22-08-45.png