Gfsh query results show a mix of PdxInstances and PreferBytesCachedDeserializables with read-serialized=true

shares |       price       |   id   | cusip  |  serializedValue   | sizeInBytes |                                 stringForm                                 | valueSizeInBytes | DSFID  |            deserializedForReading             |       value        | serialized
------ | ----------------- | ------ | ------ | ------------------ | ----------- | -------------------------------------------------------------------------- | ---------------- | ------ | --------------------------------------------- | ------------------ | ----------
70     | 590.923583984375  | 0      | MCD    | <NULL>             | <NULL>      | <NULL>                                                                     | <NULL>           | <NULL> | <NULL>                                        | <NULL>             | <NULL>
77     | 740.6094970703125 | 3      | MGM    | <NULL>             | <NULL>      | <NULL>                                                                     | <NULL>           | <NULL> | <NULL>                                        | <NULL>             | <NULL>
<NULL> | <NULL>            | <NULL> | <NULL> | org.json.JSONArray | 56          | PDX[4456129,TradePdx]{cusip=GGB, id=1, price=26.52454376220703, shares=49} | 44               | -65    | org.apache.geode.pdx.internal.PdxInstanceImpl | org.json.JSONArray | true
<NULL> | <NULL>            | <NULL> | <NULL> | org.json.JSONArray | 56          | PDX[4456129,TradePdx]{cusip=STO, id=2, price=643.344482421875, shares=85}  | 44               | -65    | org.apache.geode.pdx.internal.PdxInstanceImpl | org.json.JSONArray | true
<NULL> | <NULL>            | <NULL> | <NULL> | org.json.JSONArray | 56          | PDX[4456129,TradePdx]{cusip=MGM, id=4, price=724.223388671875, shares=0}   | 44               | -65    | org.apache.geode.pdx.internal.PdxInstanceImpl | org.json.JSONArray | true

DataCommandFunction.select results=CumulativeNonDistinctResults::[
PDX[4456129,TradePdx]{cusip=MCD, id=0, price=590.923583984375, shares=70},
PDX[4456129,TradePdx]{cusip=MGM, id=3, price=740.6094970703125, shares=77},
PreferBytesCachedDeserializable@1599752189,
PreferBytesCachedDeserializable@1120782877,
PreferBytesCachedDeserializable@1023583807
]

[info 2018/10/23 13:53:18.046 PDT  <Function Execution Processor1> tid=0x4f] Trace Info for Query: SELECT * FROM /data limit 100
    Local 192.168.2.6(76490)<v10>:1026 took 6.887ms and returned 2 results; 
    Remote 192.168.2.6(76479)<v9>:1025 took 45.164ms and returned 3 results;  indexesUsed(0)

java.lang.Exception: Stack trace
	at java.lang.Thread.dumpStack(Thread.java:1333)
	at org.apache.geode.cache.query.internal.utils.PDXUtils.convertPDX(PDXUtils.java:83)
	at org.apache.geode.cache.query.internal.CumulativeNonDistinctResults$CumulativeNonDistinctResultsCollection$CumulativeCollectionIterator.next(CumulativeNonDistinctResults.java:259)
	at org.apache.geode.cache.query.internal.utils.LimitIterator.next(LimitIterator.java:49)
	at org.apache.geode.management.internal.cli.functions.DataCommandFunction.select_SelectResults(DataCommandFunction.java:271)
	at org.apache.geode.management.internal.cli.functions.DataCommandFunction.select(DataCommandFunction.java:226)
	at org.apache.geode.management.internal.cli.functions.DataCommandFunction.select(DataCommandFunction.java:177)
	at org.apache.geode.management.internal.cli.functions.DataCommandFunction.execute(DataCommandFunction.java:125)
	at org.apache.geode.internal.cache.MemberFunctionStreamingMessage.process(MemberFunctionStreamingMessage.java:186)
	at org.apache.geode.distributed.internal.DistributionMessage.scheduleAction(DistributionMessage.java:382)
	at org.apache.geode.distributed.internal.DistributionMessage$1.run(DistributionMessage.java:448)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.geode.distributed.internal.DistributionManager.runUntilShutdown(DistributionManager.java:1099)
	at org.apache.geode.distributed.internal.DistributionManager.access$000(DistributionManager.java:108)
	at org.apache.geode.distributed.internal.DistributionManager$9$1.run(DistributionManager.java:970)
	at java.lang.Thread.run(Thread.java:745)

if (getDeserializedObject && obj instanceof VMCachedDeserializable) {
  obj = ((VMCachedDeserializable) obj).getDeserializedForReading();

if (getDeserializedObject && obj instanceof CachedDeserializable) {
  obj = ((CachedDeserializable) obj).getDeserializedForReading();