Breadcrumb trail inconsistent between two items which should have the same active trail

Issue Summary

I have a pretty basic setup:

admin/build/views is a MENU_NORMAL_ITEM
admin/build/views/list is MENU_DEFAULT_LOCAL_TASK
A couple of other items are MENU_LOCAL_TASK including admin/build/views/edit/%

But I also have some items that are NOT local tasks:
admin/build/views/export/%

So here's the interesting thing:

When visiting any of those paths that are MENU_LOCAL_TASK, the breadcrumb trail is:

Home >> administer >> site building >> views

But when visiting the one that is NOT a local task, the breadcrumb trail is:

Home >> administer >> site building

The 'views' gets dropped if it's not a local task; it gets retained if it is, but there are many reasons why an item should not be a tab. This inconsistency creates for difficult navigation; when exporting a view, there is no way to get back to views without first clicking through site building (or using the back button).