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I am not sure if this is a bug or feature, but it is a change in behavior.

Previously, at least in 0.17.41 the filter on a filter inserter or stack filter inserter was not size limited like the manual filter was if the circuit network was controlling it. As of 0.17.66 (and maybe a few before that) the inserters only take the first N items from the circuit network (1 or stack filter inserters and 5 for filter inserters)
I'm hoping this is a bug that was introduced, as I did not see the behavior on any of the release notes.

Here is a simple blueprint showing the behavior with 1 constant combinator, 1 stack filter inserter and 1 filter inserter:
Copy blueprint

Thanks for the report however I'm not sure what you're actually referring to. Inserters have never supported having more filters than they support in the prototype. We (as far as I know) haven't touched that logic in over a year.

Can you please post a save file and game version showing what you say it was doing vs what it is doing now?

This save game is from my sandbox build that I build under 0.17.41. When I was building it in particular the stack filter inserter at the bottom of the train loop would support a filter of all of the items not in the "outpost" stations about half way up the loop.

If you can run this under 0.17.41 and add multiple items to the constant combinator at one of the "outposts" you should be able to see that the stack filter inserter has all the needed items in it's filter. Under 0.17.66 it only has one item.

I sorry I don't have a better working save as I've update (I use steam) and the other saves are now at 0.17.66 and not working the way they were when I built them.

You must have been using a mod which changed the number of filters in the stack filter inserter because the base game stack filter inserter has only ever supported 1 filter.

I went and tried a save with 0.17.56 and it had the same behavior. I must have been hallucinating the filters in the earlier version. I'm sorry and thank you.

Maybe you used a normal filter inserter, which has more filters..?

Nevermind, I didn't read carefully