an estonish example of buggy reduce

list.tsx

const defaultResults = {
  default: [],
  prolyConjugated: [],
  femininePlural: [],
  conjugated: [],
  renderCount: 0,
};

const getFilteredResults = (data: string[]): FilteredResults => {
  return data.reduce<FilteredResults>(
    (acc, word) => {
      if (
        word.endsWith("AI") ||
        word.endsWith("AT") ||
        word.endsWith("AIT") ||
        word.endsWith("ONT") ||
        word.endsWith("EZ")
      ) {
        acc.conjugated = [...acc.conjugated, word];
      } else if (word.endsWith("A") || word.endsWith("ENT")) {
        acc.prolyConjugated = [...acc.prolyConjugated, word];
      } else if (word.endsWith("S") || word.endsWith("EE")) {
        acc.femininePlural = [...acc.femininePlural, word];
      } else {
        acc.default = [...acc.default, word];
      }

      return acc;
    },

    defaultResults
  );
};