Not sure if I'm being dumb (spoilers)

[Croniss90]

If the stun gun is the one with this inventory icon (if the attachment worked) then yes, else, it's not in the box anymore

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The inventory image is that it looks like a fat pregnancy test, only way I can think to describe it

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Yep. Definitely a bug. I reverted back to a prior save, got the stun baton again and now it is being equipped when I approach a robot.

I'll try to replicate the bug again and will update.

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Tried a couple times now and haven't managed to replicate it. I have a screen shot still that proves there's an issue here, I'm just unsure of how to replicate it, so I'll leave it to Frictional whether they want to investigate.