Ouch .... just like others i dont use twitter and thats not a good way to announce major changes. I have been playing my necro for at least 18 months and arrive on mount and crash in to kill opposition, but then today I had NO support as my minions were gone and worse they were still regenerating. Luckily I was just farming iron ore in Harathi Hinterlands so i was not killed, but it took me a couple of goes before I realised what was happening.
I understand them disappearing if you go in water as the minions change, but just mounting moving and dismounting should not affect them this is a critical issue and should be fixed as soon as possible.
Will have to rethink "End of Dragons expansion"