Let me see if i get what you are asking
You are asking that for example you got 2 VAPS
And when you put one VAP on tunnel mode and the other on Bridge mode it doesnt work as soon as you put it on bridge mode one of the VAPS
If i got your question right, that should be a bug, it should work just fine...
I remenber i have done that before, and to recheck that i changed one of the VAPs to bridge mode to see if i see the AP going on inactive or dirty config and that never happened( i mean on a AP group i got which has 3 VAPS, in this case it has 2 tunneled VAPS and one Bridge VAP)
What code do you have?
cheers
Carlos