In WPP, the text requires to parse the syntax element end_of_sub_stream_one_bit at the end of each tile line if end_of_slice_segment_flag is equal to 0. It corresonds to the syntax element alignment_bit_equal_to_one and it must be equal to one. It seems that the parsing of end_of_sub_stream_one_bit and the check have not been done in the reference software in WPP. I suggest to add the following code in the function

Void TDecSlice::decompressSlice(TComInputBitstream ppcSubstreams, TComPic*& rpcPic, TDecSbac* pcSbacDecoder, TDecSbac* pcSbacDecoders)
...

cSigma.m_CbCounter=0;

#endif
#endif

m_pcCuDecoder->decompressCU ( pcCU );

#if ENC_DEC_TRACE

g_bJustDoIt = g_bEncDecTraceDisable;

#endif

pcSbacDecoders[uiSubStrm].load(pcSbacDecoder);

UInt uiTileRightEdgePosInCU = rpcPic->getPicSym()->getTComTile(rpcPic->getPicSym()->getTileIdxMap(iCUAddr))->getRightEdgePosInCU();
UInt ruiBit;
if ( (uiCol == uiTileRightEdgePosInCU) && (pcSlice->getPPS()->getEntropyCodingSyncEnabledFlag()) && !uiIsLast)
{

pcSbacDecoder->parseTerminatingBit(ruiBit);
assert (ruiBit);

}

Store probabilities of second LCU in line into buffer

if ( (uiCol == uiTileLCUX+1)&& (depSliceSegmentsEnabled

(pcSlice->getPPS()->getNumSubstreams() > 1)) && (pcSlice->getPPS()->getEntropyCodingSyncEnabledFlag()) )

{

m_pcBufferSbacDecoders[uiTileCol].loadContexts( &pcSbacDecoders[uiSubStrm] );

}

...