Infix modifier is not covered by the EBNF

[susliko]

The following code is valid in Scala 3.3.1

object Test:
  infix def hello = 2001

But it seems to be not covered by the ebnf grammar, as "infix" is only mentioned as a soft keyword.
Probably, it should be among others in the LocalModifier

LocalModifier     ::=  ‘abstract’
                    |  ‘final’
                    |  ‘sealed’
                    |  ‘open’
                    |  ‘implicit’
                    |  ‘lazy’
                    |  ‘inline’