Should audience field be limited to groups members have permission to create a group content??

Hello
I have a question regarding audience field. I have two group types space and workroom. I set global permission so that members can create workroom only in space but not in workroom.
I have a group content called blog and members can create blog in space but not in workroom.
but when member create blog in space, in audience og_group_ref they can still see their workroom as option even though they cannot create blog in workroom. I used entityreference prepopulate here.
Shouldn't it be that og_group_ref not only shows the group they are member of but also be refined by the group they have permission to create said content??? or am I having unreasonable expectation here??
I was able to bypass this by setting prepopulate disabled but it did raise the question for me in regards to audience.
Note: I use og_subgroups in the hope it might help and add the permission inheritance and set it to use generic permission for subgroup and not the permission of parent group. but even that did not help.
I opened issue here because I am not sure if this is og question or og-subgroup question.