Strange vector mask behaviour - rare issue - suddenly, seemingly inverted? - glitch? bug? PEBCAK?

while drag-dropping vector masks on smart objects, came across issue vector mask mask layer contents in incorrect way - specifically, behaved subtractive mask instead of default "combine shapes" mask.

 

 

in image attached, can see green shape* has layer mask applied, vector mask should producing narrow slit of green. verified thumbnail of said mask, properties of vector shape defines shows "combine shapes" mode (see red arrow).

 

*(a smart object containing simple green "shape" purposes of visibility. originally, when issue occured, jpeg drag-dropped new smart object layer.)

 

if manually copy vector mask of green layer red shape layer, replacing red layer's mask, mask of red layer behaves correctly: in situation, fill in green-shape's hole red. if things working should be, both layers identical, , red shape cover green.

 

something wonky. going on?

 

(psd file available)

 

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adobe photoshop version: 13.0.1 (13.0.1 20120808.r.519 2012/08/08:21:00:00) x64

operating system: windows 7 64-bit

version: 6.1 service pack 1

system architecture: intel cpu family:6, model:14, stepping:5 mmx, sse integer, sse fp, sse2, sse3, sse4.1, sse4.2, hyperthreading

physical processor count: 4

logical processor count: 8

processor speed: 2931 mhz

built-in memory: 8183 mb

free memory: 2483 mb

memory available photoshop: 7230 mb

memory used photoshop: 59 %

can invert mask in layer palette?

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