Why PrefixMatcher cannot be triggered only by kotlin completions?

Hi all,

Recently discovered that code does not work correctly when users write in kotlin.All other languages execute normally, except when writing kotlin code.

class ChineseCompletionContributor : CompletionContributor() {

    override fun fillCompletionVariants(parameters: CompletionParameters, result: CompletionResultSet) {
        val prefix = result.prefixMatcher.prefix.toLowerCase()
        val resultSet = result
                .withPrefixMatcher(ChinesePrefixMatcher(prefix))
        resultSet.runRemainingContributors(parameters, { r ->
          // No access here.
        }, false)
        resultSet.restartCompletionOnAnyPrefixChange()
    }
}

class ChinesePrefixMatcher(prefix: String) : PlainPrefixMatcher(prefix) {
    override fun prefixMatches(name: String): Boolean {
        return if (Pinyin.hasChinese(name)) {
            for (s in toPinyin(name, Pinyin.LOW_CASE)) {
                if (countContainsSomeChar(s, prefix) >= prefix.length) {
                    return true
                }
            }
            return false
        } else super.prefixMatches(name)
    }

    override fun cloneWithPrefix(prefix: String) = if (prefix == this.prefix) this else ChinesePrefixMatcher(prefix)
}

ChinesePrefixMatcher working properly，but it doesn't have the value I want to pass to it.The values here are non-ascil.

This is my plugin.xml，and I tried changing the order attribute to either "first" or "last" without triggering correctly.

<extensions defaultExtensionNs="com.intellij">
    <completion.contributor language="any"
                            order="first"
                            implementationClass="com.github.tuchg.nonasciicodecompletionhelper.extensions.ChineseCompletionContributor"/>
</extensions>

Thanks