I play a necromancer with 3 skeletons (2 rogues, 1 warrior), a golem, 1 death knight arch skeleton mage and some wraiths. I have a non-decaying abomination with the fractured end and age of undeath nodes.
When I transition zones while having a skeletal vanguard at the same time as an abomination, all minion indicators disappears from the UI, and only the indicator with 1 skeletal vanguard stays stuck. It stays broken until I reload the game.
I also had a problem where I transitioned screens while dragging an item by mistake, and the translucent image of the item was stuck in a similar way, so it might have something to do with a skeleton vanguard being created / replaced during the zone transition because the abomination is destroyed when exiting a zone.