[lleon596]

Do you have "Sync playback to display" disabled? Enabling "Sync playback to display" will disable passthrough.

"Sync playback to display" is disabled. Passthrough is working on DTS and AC3 but EAC3 is downmixed to stereo , in the log I see :

23:49:06.562 T:139801579742976 DEBUG: FactoryCodec - Audio: passthrough - Opening
23:49:06.562 T:139801579742976 DEBUG: FactoryCodec - Audio: passthrough - Failed
23:49:06.562 T:139801579742976 DEBUG: FactoryCodec - Audio: FFmpeg - Opening

I've attached full kodi.log ...

23:41:23.420 T:139802529502656 NOTICE: m_displayNameExtra: MEI Panasonic-TV on HDMI
23:41:23.420 T:139802529502656 NOTICE: m_deviceType : AE_DEVTYPE_HDMI
23:41:23.420 T:139802529502656 NOTICE: m_channels : FL,FR
23:41:23.420 T:139802529502656 NOTICE: m_sampleRates : 32000,44100,48000
23:41:23.420 T:139802529502656 NOTICE: m_dataFormats : AE_FMT_RAW,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_RAW

That won't work as long as your box syncs with the TV instead of the AVR. Disable ARC and retry. For HD Audio you need 192 khz samplerate and 8 channels.

I did not quite understood you
The box connected to Sharp HB60 soundbar which have Dolby/DTS decoders via HDMI and the soundbar output to TV HDMI(ARC) input .
I had no problems ever to passthrough DTS and Dolby with that setup .
How should I disable ARC ? Different HDMI port in TV ?
Also in log the stream audio properties :
Stream #0:1[0x101](ger): Audio: eac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 256 kb/s

Thanks..