If an ABS connection looks poor but passes water test: leave alone or ??

As noted on another thread we did our DWV water test and I noticed one of the horizontal connections from a 3" horizontal run in basement to the main stack seems like there are some visible voids in the glue joint . It seems to hold the water just fine, but is that going to fail at some point or is it likely working fine but just looking imperfect?

It'd be a pain to change it of course, but we'll do what we must, if we must. Please advise!

 

If it does not leak with a 10' head water test, it will not leak under normal usage or come apart later.

 

There is really no good indicator on the outside of a glue joint. A large bead of glue could just indicate they used too much, and absence of a bead does not tell much.