Concatenated Words (wrong solution 2)

/**
passed input: ["cat","cats","catsdogcats","dog","dogcatsdog","hippopotamuses","rat","ratcatdogcat"]

fails on input: 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*/

class Solution {

    fun findAllConcatenatedWordsInADict(words: Array<String>): List<String> {
        val result: MutableList<String> = LinkedList()

        val set = words.toSet()
        for(word in words) {

            val subwordEndIdxs: Queue<Int> = LinkedList()
            subwordEndIdxs.add(-1)

            while(subwordEndIdxs.isNotEmpty()) {
                var subwordStartIdx = subwordEndIdxs.poll() + 1

                var subword = ""
                for(i in subwordStartIdx until word.length) {
                    subword += word[i]
                    if(set.contains(subword)) {
                        if(subword != word && i == word.length - 1) {
                            result.add(word)
                        }
                        subwordEndIdxs.add(i)
                    }
                }
            }
        }

        return result
    }
}