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Driving Blueprint FX via Sequencer without entering PIE mode

I am using a mask dissolve effect from here https://youtu.be/_YTw-pFuWig

I am also creating a Cinematic, not a game so everything is driven from my Level Sequencer.

I am able to trigger particle effects from my Sequencer but cannot get this effect to work unless I use PIE or SIE modes.
ie simply animating the mask fx cube from the Sequencer does not enable the effect. I must enter PIE mode.

The attached clips should make this a bit more clear.

1 Manually dragging mask fx cube in editor (Construction Script)
https://vimeo.com/484481911/45e12b3114

2 PIE mode animating mask fx cube (Event Tick in Event Graph)
https://vimeo.com/484481932/170e15fa16

3 animating mask fx cube via Sequencer (no PIE mode)

Can any Blueprint experts help? Can this type of effect be done without entering PIE mode?