His performances dropped after the Sweden game. Or, to put it another way, he only had a couple of months of good performances.
I think he's tried, and Man U won't have asked him not to get into risky situations. They need his talent to develop, and they're not going to get that by asking him...
He's available
Note - I've said that as it's the answer that's on Palace's forum. Is the type of loan for Zaha different than for Dobbie, as Dobbie joined Palace on loan on 31st Jan, and he won't be available for the final because the maximum loan length will have been met.