From the new preview from Ravos, we have "Steadfast [Fear 2]". It is the first instance of a number in the Steadfast keyword. The rules for Steadfast say this:
QuoteSteadfast [X]: While a unit with this keyword is suffering a morale test, the cards of the type specified by X are treated as having one additional morale icon.
Rules as written, the X would be replaced by "Fear 2", which is not a card type. "Fear" is a card type, but X is not the number "2", so there isn't "2" additional morale icons.
We know what the rule intent is, though. Perhaps there needs to be an errata/FAQ for this new instance.
This doesn't fall under 45.7 either since it's not multiple instances either. It's just one instance of the keyword.
QuoteIf an upgrade or other game effect causes a unit to have one or more instances of a keyword that has an “X” value, treat the unit as having a single instance of that keyword with an “X” value equal to the sum of the “X” value of all of that
unit’s other instances of that keyword.