Error with merge function in Fuses

Hey guys,
I'm finding the using the following code is erroring out my Fuse, but changing the 'MO_ApplyMode" to anything other than 'Normal' (i.e. Darken) lets the fuse function correctly.

my_merge:Merge(my_intput, {
MO_ApplyMode = "Normal",
MO_ApplyOperator = "Over",
MO_FgAddSub = 1,
MO_BurnIn = 0,
MO_FgAlphaGain = 1,
MO_DoZ = false,
})

Seeing as this code worked for previous versions of Fusion has there been a change to the API or is this a bug?

Cheers,
E

Just to clarify, the error is seen in Fusion 8.2.1 build 6 for Windows.
E

So it seems that commenting out the merge property:
(-- MO_ApplyMode = "Normal), effectively not setting the apply mode causes the merge function to default to "Normal" mode and operate correctly.

Though this workaround works for now it would be best practice to be able to explicitly pass default args and not have the function fail.
E