Kinda illustrates why this 'march' needs to stop at versions where there were changes enough to be able to use tools provided to help with the 'march'. On a previous 'march' of such a system (it's been many, many, many moons ago) I re-call clicking only on the first two links ... until it reported no issues found. Then, and only then, could one march forward without possible 'catch 22's'.
So maybe the march needs to go from 2.3 -> 2.6 where that tool last appeared - if I re-calll correctly.
Another bump coming up ... themes. And I'll let you discover that yourself ... can't miss it! ;)
'spirit of sharing', Ken