But "Oxford Learner's Dictionary" has a different opinion: https://www.oxfordlearnersdictionaries.com/definition/english/research_1#research_inflg_4
1) praca wykonywana przez naukowca, której celem jest uzyskanie nowej wiedzy - work done by scientist which's purpose is to find new knowledge
2)a sprawdzenie stanu zdrowia pacjenta checking patient's state of health
2)b wynik sprawdzenia stanu zdrowia pacjenta result of checking patient's health
It seems to me like the usual behavior of neuter singular nouns, their Genitive plural form usually ends with a consonant...
Also, you said "feminine plural", but the thing that people call sometimes "feminine plural" is actually a plural for all nouns that do not describe male people, so "badanie" is there as well.