ID 217952 - STMap kills 2D motionblur from Transform node upstream

Problem summary
STMap kills 2D motionblur from Transform node upstream​

Customer reported version
nuke.9.0v8

Customer reported platform
Scientific Linux 6.7 

Steps to reproduce

1) Open attached STmap_kills_moblur.nk​
2) View Checkerboard, then view Transform to see the motion blur 
3) View STMap, motion blur disappears

WORKAROUND
4) Add Grade between Transform and STMap, motion blur returns

Reproduced by support
MacOSX
10.0v1 and 8.0v6 (have not regressed further)

Expected behaviour
STMap should preserve motion blur from the Transform

Actual behaviour
STMap eliminated motion blur from Transform, unless a (null)Grade node was added between