what happens:
let's say I add a recipe for liquid copper and liquid iron. then, I set a limit on the foundry for iron, in order to add another one but with other modules (by the way, there is also a problem there, that the next line does not try to cover the shortage, but I think the problems are related here). then, I notice that setting a limit somehow limits copper, even if it is higher/lower in the chain and has only a common ingredient. I tried with other recipes/machines, the situation is repeated

what I expect:
the limit of 1 recipe will not affect others.
the limit of 1 recipe will allow the next one to take the "load" on itself(as I wrote in brackets, in order to have several machines with a different set of modules)

just in case, information from the bug report menu

---- Feature Flags ----
expansion_shaders:true
freezing:true
quality:true
rail_bridges:true
segmented_units:true
space_travel:true
spoiling:true
---- Mods ----
base:2.0.20
elevated-rails:2.0.20
helmod:2.0.10
quality:2.0.20
space-age:2.0.20
```

Assembler limitation used to found a better ratio
for one recipe you must used % production in Edit Recipe

ok, although I don't yet understand how I can set % equal to 1 in assembler except by brute force

you can put your line in a block
you can use arithmetic formula in the input text, if you see 5.5 machine % production = 100/5.5
there are few way