AC3 Passthrough partially broken

Hello
I have a problem in current Beta (v17 beta 1 and beta 2) concerning TV-Channels with ac3 audio streams, and would be really glad if someone could give me a hint on how to remedy this.
The audio chain should be capable of decoding every codec.

Quote:17:09:00 T:3216 NOTICE: Enumerated WASAPI devices:
17:09:00 T:3216 NOTICE: Device 1
17:09:00 T:3216 NOTICE: m_deviceName : {B1E5C3A9-97E6-4A0C-82F0-047B8FEE3398}
17:09:00 T:3216 NOTICE: m_displayName : HDMI – Panasonic-TV-4 (NVIDIA High Definition Audio)
17:09:00 T:3216 NOTICE: m_displayNameExtra: WASAPI: Panasonic-TV-4 (NVIDIA High Definition Audio)
17:09:00 T:3216 NOTICE: m_deviceType : AE_DEVTYPE_HDMI
17:09:00 T:3216 NOTICE: m_channels : FL,FR,FC,LFE,SL,SR
17:09:00 T:3216 NOTICE: m_sampleRates : 192000,96000,48000,44100
17:09:00 T:3216 NOTICE: m_dataFormats : AE_FMT_S24NE4MSB,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE,AE_FMT_RAW
17:09:00 T:3216 NOTICE: m_streamTypes : STREAM_TYPE_DTSHD,STREAM_TYPE_TRUEHD,STREAM_TYPE_EAC3,STREAM_TYPE_DTSHD_CORE,STR​EAM_TYPE_DTS_2048,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_512,STREAM_TYPE_AC3

Whenever i stream a tv channel through tvheadend backend the AC3 stream gets decoded and the output format is PCM.

Quote:17:09:32 T:4216 NOTICE: Creating audio stream (codec id: 86019, channels: 6, sample rate: 48000, no pass-through)

When i play a mkv containing ac3 everthing seems to work as expected:

Quote:17:09:45 T:5292 NOTICE: Creating audio stream (codec id: 86019, channels: 6, sample rate: 48000, pass-through)

This has already been working, but i made some changes in the past (Kodi v17 beta1, beta2, another graphics card), and i am unsure which one broke this.

Many thanks to anyone having a look at this

Following the full log of both attempts to play an stream/file containing ac3 audio streams:
http://pastebin.com/xdZK4fh9