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MasterInformationBlock (see the capital letter at the beginning or the word) is not the name of a node, but the type of a structure referenced by the 'message' node. The 'message' field could eventually have been named 'masterInformationBlock' but this is not how the ASN.1 description has been written. So it's perfectly normal not to have it displayed.

MasterInformationBlock (see the capital letter at the beginning or the word) is not the name of a node, but the type of a structure referenced by the 'message' node. node:

BCCH-BCH-Message ::= SEQUENCE {
    message                 BCCH-BCH-MessageType
}

BCCH-BCH-MessageType ::=                        MasterInformationBlock

MasterInformationBlock ::=          SEQUENCE {
    (...)
}

The 'message' field could eventually have been named 'masterInformationBlock' but this is not how the ASN.1 description has been written. So it's perfectly normal not to have it displayed.