a/v desynchronization

[Peter82kr]

Environment Info
OS : Windows 10 x64 (16299)
CPU: Intel Core i7-4790K @ 4.00GHz [TB: 4.40GHz] (4C/8T)
RAM: Used 4022 MB, Total 16341 MB
GPU: GeForce GTX 1060 6GB (10 EU) @ 1708 MHz (388.59)

List of available features.
Codec: H.264/AVC
Max Bframes               4
RC Modes                  63
Field Encoding            yes
MonoChrome                no
FMO                       no
Quater-Pel MV             yes
B Direct Mode             yes
CABAC                     yes
Adaptive Transform        yes
Max Temporal Layers       0
Hierarchial P Frames      no
Hierarchial B Frames      no
Max Level                 51
Min Level                 1
4:4:4                     yes
Max Width                 4096
Max Height                4096
Dynamic Resolution Change yes
Dynamic Bitrate Change    yes
Forced constant QP        yes
Dynamic RC Mode Change    no
Subframe Readback         yes
Constrained Encoding      yes
Intra Refresh             yes
Custom VBV Bufsize        yes
Dynamic Slice Mode        yes
Ref Pic Invalidiation     yes
PreProcess                no
Async Encoding            yes
Max MBs                   65536
MAX MB per sec            983040
Lossless                  yes
SAO                       no
Me Only Mode              yes
Lookahead                 yes
AQ (temporal)             yes
Weighted Prediction       yes
Max LTR Frames            8
10bit depth               no

Codec: H.265/HEVC
Max Bframes               0
RC Modes                  63
Field Encoding            no
MonoChrome                no
Quater-Pel MV             yes
B Direct Mode             no
Max Temporal Layers       0
Hierarchial P Frames      no
Hierarchial B Frames      no
Max Level                 62
Min Level                 1
4:4:4                     yes
Max Width                 8192
Max Height                8192
Dynamic Resolution Change yes
Dynamic Bitrate Change    yes
Forced constant QP        yes
Dynamic RC Mode Change    no
Subframe Readback         yes
Constrained Encoding      no
Intra Refresh             yes
Custom VBV Bufsize        yes
Dynamic Slice Mode        yes
Ref Pic Invalidiation     yes
PreProcess                no
Async Encoding            yes
Max MBs                   262144
MAX MB per sec            983040
Lossless                  yes
SAO                       yes
Me Only Mode              yes
Lookahead                 yes
AQ (temporal)             no
Weighted Prediction       yes
Max LTR Frames            7
10bit depth               yes

now i try reproduce your procedure and post reply after that.

EDIT:
What I did:

• start Hybrid
  
• set 'Base->Processing->Audio' to 'passthrough (all)'
  
• set base > processing > video >  passtrough all only one difference with your procedure. its ok?
  
• made sure 'Filtering->Support' was set to Avisynth
  
• enabled 'Config->Internals->Avisynth->Always use Avisynth'
  
• set an output file
  
• added a new job
  
• started the job processing
  

and output file is desynced