When in darkroom, on the left panel when styles are selected and the box to duplicate image is checked, after the style is appended - no duplicate of original image seems to be created.
However, in lightroom on the right panel when styles are selected and the check box to create duplicate image is checked, a duplicate image is created.
Is this a bug or am I missing a processing step somewhere?
I experience the same, think of a bug… 
Thanks for the update.
The styles module is only for lighttable. In darkroom you need to create a duplicate, make it active, and apply the style using the menu underneath the bottom left of the image (looks like 3 circles).
When the image is in darkroom it is “locked” for editing and applying a style using the styles module will at best do nothing and at worst crash darktable.
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But you can unhide the module in the darkroom. Is this a bug, then?
I am replicating this behaviour with DT5.4 on windows. I feel it is a bug that would be worth reporting
That module is a lighttable module and not supposed to be used in darkroom. The function that applies styles is different in darkroom than lighttable (hence the worst case of crash).
A side effect of being able to hide and make modules visible is that it’s possible to make lighttable only modules visible in darkroom.
EDIT: You can probably make the lighttable history_stack module visible too, but it wont work either. Another thought is that neither of these modules may work in darkroom because they work on selected images in lighttable and none are selected since the view is in darkroom.
Bill, I’m relatively new to darkTable and I’m using what I think is a vanilla install. How it became unhid is unknown to me. I am using V5.4 with elegant-grey theme.
I will attempt to hide it again in the left panel in darkroom. What I find a little misleading though is that the styles module is listed under Utility modules in the online manual. And it says that processing modules are used exclusively in the darkroom view while “Utility modules may be used in any darktable view.” and that seems not to be the case from your message.
It seems logical that you might wish to apply a style in darkroom to an image and then immediately modify the image if needed while still in darkroom.
It seems to work aside from not creating a duplicate if checked.
I went and looked at the code and someone did the changes to allow it to be used in darkroom. So, if it’s not creating a duplicate when checked it’s probably a bug and needs an issue raised.
Note to self: check the code instead of relying on memory from a couple of years ago 
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