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I had the exact same situation with my gasket kit (for reference, I’ve got the Gaggia G105).
Basically, there should be a washer that the nut uses to compress the sightglass seal. Like you, none were present on strip-down so I assumed they weren’t needed. Got the misted window. I tried the white plastic ones that got shipped with the kit but they didn’t fit properly. I tried to modify them to size and it was better but not perfect. Went to a local fastenings shop and got two brass washers the right size, problem solved.
Edit: Part 100 here
Ptown
There was no washer fitted when I took it apart - just sightglass, nut, gasket.
There are some white plastic washers in the gasket and seal kit I bought - are those what you are referring to?