Has anyone else noticed this quirk with Classic and Classic Plus awards (domestically at least)?
If classic awards are available on a flight, then classic plus awards (even in other booking classes) on that same flight are not
. Below is just an example but it seems fairly common across routes and destinations: if there is Y (or J!) classic awards available, then classic plus won't be, even if the the fare classes that would typically signal classic plus availability (eg. D or I for Business) are present confirmed by EF.

If classic awards are available on a flight, then classic plus awards (even in other booking classes) on that same flight are not

