1) In HM8.0, when ALF is removed from the software, TComAdaptiveLoopFilter::PCMLFDisableProcess() was also removed, although it is necessary to prevent SAO from altering PCM or lossless-coded CUs.

2) Even if we revert the function, it has a bug as discribed below.

PCMLFDisableProcess() calls xPCMRestoration().
xPCMRestoration() calls xPCMCURestoration() for each CU if (pcm_enabled_flag = 1 and pcm_loop_filter_disable_flag = 1) OR transquant_bypass_enable_flag = 1.
xPCMCURestoration() restores the unfiltered pixel values with the following condition:

if ((pcCU->getIPCMFlag(uiAbsZorderIdx))

pcCU->isLosslessCoded( uiAbsZorderIdx))

This should be corrected as follows:

if ((pcCU->getIPCMFlag(uiAbsZorderIdx) && pcPic->getSlice(0)->getSPS()->getPCMFilterDisableFlag())

pcCU->isLosslessCoded( uiAbsZorderIdx))

The current condition ignores pcm_loop_filter_disable_flag, so it misjudges when

pcm_enabled_flag = 1
pcm_loop_filter_disable_flag = 0
transquant_bypass_enable_flag = 1
pcm_flag = 1
cu_transquant_bypass_flag = 0

Because pcm_loop_filter_disable_flag = 0, this I_PCM CU should be SAO filtered, but with the current condition it won't.