I'll wager that the cabin divider has been moved forward and that you have been ousted by that move. Although it won't show yet - don't despair!

If you can hold D and F unless they are packed E won't get filled (but D or F would if you take my meaning) - but be on the trigger for OLCI and you may find that 2A + C are still vacant although you can't see it.

Complaining will get you nowhere - unfortunately irritating though it is.