So I'm running into the same issue. I have a project in Revit. Exporting a linked revit model to a NWC file from Revit. Worksets and links are included. Worksets in Revit contain both upper and lower case ie M-Pipe, M-Duct, A-Exterior......
In my Example M-Pipe is coming from a the Piping model that is linked into my Architectural model.
So when you select the object in Navis, in the properties, it's displaying as M-Pipe. So I use the Find Items tool, select them all, and create a Search Set based on Workset = M-Pipe. (Side note - I'm using this mostly for the appearance profiler, but I'm also using it to filter for Clash Detective). I get that all set up, save the search set, save the model and close.
Next day, I open Revit, Export the view containing the Piping model (same as I did the day before), close Revit, Open my NWF file that contains the newly updated NWC. When I go to the same Search Set I created the day before it's now looking for items with Workset = m-pipe and can't find any. So I have to go select the pulldown for options of worksets and "m-pipe" doesn't exist, "M-Pipe" exists. So I have to go manually reset them in order for it to work again.
I'm hearing from my MEP Consultant, who's doing a similar process, only he's exporting the NWC directly (not from a link) and running into the same issue. Others in his office are also running into the same issue.
So this appears to be a programming Bug. I'm looking for a fix. I'm wondering if we change all of the worksets to being all lowercase if that's the solution while Autodesk looks for a problem/solution?
I'm sure others have run into this issue. We can't be the only ones.
Thanks in advance.