It sounds like a similar problem however this function was working perfectly for me in 1.0.2 and it's only since upgrading to RC2 that I've had problems. From other posts above it looks like it was happening in RC 1 but I skipped that revision.
This function still working, as you can see on screenshots (combined channel has DVB-T and DVB-S tuning details). bug is only in channel groups where it has two links to the same channel. If you delete one of the doubled links, all become to normal state.