Duplicate operator is borked with block movements

[DJMcMayhem]

For example, this program should output

HHello
WWorld

But does not. Or this program is a more explicit way to do the same thing (the program is <M-d><C-v>j)

It doesn't seem to be causing issues when you override the linewise setting with V or v, only <C-v> and mappings that use it.