OSCAM EMU problem, when using dual or FBC tuners

I have a VU+Duo 4K SE with dual FBC tuner (8 demuxer). I'd like to decode 4 BISS coded feeds parallel and stream them to client devices.

Receiving the 4 feeds is no problem. I can stream them to all devices parallel. So the tuner and demuxer side is ok. 1 stream gets decrypted by the BISS key, but when i like to watch another channel in parallel, OSCAM uses the same key it uses for stream 1, even there is a correct key for stream 2 defined in Softcam Key file. Is this a bug, or how does OSCAM decide which key to use for which stream? Is there someone with the same problems? I see the same problems on my Octagon SF8008 and on my ZGemma H9.2S with dual tuners, no matter which image i use. I tried out a lot of different images. Currently OpenATV 7.5 on Octagon and ZGemma, OpenBlackhole 5.5.1 on VU+, so it seems to be an OSCAM issue.

OK, after another 3 days of testing and modifications, the problem still exists.

I'll send the VU+ back to supplier, as this was the only feature I needed. I'll use four cheap single receivers instead.

As a simple workaround i deleted oscam and now send the encrypted streams directly to VLC instances on PC, where they are demuxed and decrypted. VLC has libcsa implemented and can decrypt constant cw streams.

A shame that oscam can't adress the correct key to the correct demuxer, even when custom provider id's are used. That doesn't work at all for multiple BISS streams with the same SID. For me it looks like a bug for FBC tuners, when oscam returns the key to DVB-API. It could also be a DVB-API problem.