By “bug” do you mean the inability to add a lot of requirements to a collection project? If so, that was never an issue that was “fixed” because projects were not designed to support hundreds and hundreds of requirements. Whether we should increase the timeout limit and support larger collection projects is something our devs would have to take a look at and see what’s feasible.
We have an issue to display a better error message than the current “undefined” one but it hasn’t been worked on yet. I re-opened this thread, which I had mistakenly marked as solved. Since this is an issue that doesn’t break iNaturalist and/or affect a lot of projects, it’s not prioritized very highly.