See the screenshot. There are two updates that claim to fix a single bug (that is correct, both of them are needed). One is stable, one is in testing. The BBA shows [stable] label. That is confusing, that seems to indicate that everything needed is in stable. (One might happen to visit that bug and close it, without inspecting it closer).

I think a better choice here is to show the "worst" status in the label. Therefore:

{{{
update X: stable
update Y: testing
-> label: [testing]

update X: stable
update Y: stable
-> label: [stable]

update X: pending testing
update Y: testing
-> label: [pending testing]

update X: pending stable
update Y: testing
-> label: [testing]

update X: stable
update Y: pending stable
-> label: [pending stable]
}}}

So, if you have an ordered array ['pending testing', 'testing', 'pending stable', 'stable'], you pick the lowest index available in update XYZ statuses and show that as the label.

What do you think?