Highlight does not work properly with ScriptScore, version 7.8

Elasticsearch version (7.8):

OS version (Windows 10):

Along with ScriptScore function, Highlight function does not work properly. If we search two words only first word gets higlighted or last word doesn't display highlighted:

Eg. Doc content- this is a boy
On searching - this is
Output content shows only 'this' as highlighted

       var searchResponse = await elasticClient.SearchAsync<Document>(body => body

           .Index(Settings.Index + "-*")
                 .Query(qx =>

                         qx.ScriptScore(fx => fx
                   .Query(qt =>

                  (bb => bb.Must(q =>
                     q.MatchPhrasePrefix(m => m.Field(f => f.Content).Query(req.SearchText)))  // q.Terms(c => c.Field(p => p.Tags).Terms(words))

                    .Script(w => w.Source("String gmtString = params.searchdate;ZonedDateTime zdt = ZonedDateTime.parse(gmtString,DateTimeFormatter.RFC_1123_DATE_TIME);ZonedDateTime zdt2 =ZonedDateTime.of(doc['date'].value.year,doc['date'].value.monthOfYear,doc['date'].value.dayOfMonth,doc['date'].value.hourOfDay,doc['date'].value.minuteOfHour,doc['date'].value.secondOfMinute, 0, ZoneId.of('Z')); if (zdt2.toInstant().toEpochMilli()==zdt.toInstant().toEpochMilli()){return 100;}else{return _score;} ").Params(par))) 

           ).Highlight(h => h.Fields(
                 fs => fs
        .Field(p => p.Content)
     fs => fs
        .Field(p => p.Attachment.Content).NumberOfFragments(0).Type(HighlighterType.Unified)

Please suggest any solution

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