Transformation Error 'Fn::ForEach could not be resolved' when using a Mapping Default in 1.21.0

Transformation Error 'Fn::ForEach could not be resolved' when using a Mapping Default in 1.21.0: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I've got a template that uses an Fn::ForEach with !FindInMap , it uses a DefaultValue . Most the Mappings don't override…