Is the named_curve_list max size in RFC 8422 wrong?

Question

In Chapter 5.1.1. of the RFC 8422 ECC Cipher Suites for TLS the NamedCurveList is described as:

struct {
       NamedCurve named_curve_list<2..2^16-1>
   } NamedCurveList;

And NamedCurve:

enum {
    deprecated(1..22),
    secp256r1 (23), secp384r1 (24), secp521r1 (25),
    x25519(29), x448(30),
    reserved (0xFE00..0xFEFF),
    deprecated(0xFF01..0xFF02),
    (0xFFFF)
} NamedCurve;

From Chapter 4.3 in RFC 5246 it says;

... the length declares the number of bytes, not the number of elements, in the vector.

and also:

The length of an encoded vector must be an even multiple of the length of a single element

And in Chapter 4.5:

An enumerated occupies as much space in the byte stream as would its maximal defined ordinal value.

My understanding is that the NamedCurve occupies two bytes and a list of NamedCurve would always occupy a multiple of two bytes. So why is the upper limit of the named_curve_list written as 2^16-1 which is an odd number?