fc command substitution behavior, possible bug

[smallnow]

$ echo $BASH_VERSION
3.2.48(1)-release
$ echo $(fc -nl -1)
echo $BASH_VERSION


$ echo $BASH_VERSION
4.0.10(2)-release
$ echo $(fc -nl -1)
echo $(fc -nl -1)

I see there were a lot of changes to fc, is this intended or a bug?

It seems there is another way to get the last history entry that works the same
in command substitution regardless of 3.2 vs 4.0:

$(history -p '!!')

- Ian Kelling