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The ASN1 code of TS 38.413 15.0.0 which is what Wireshark is based on has:

S-NSSAI ::= SEQUENCE {
sST             SST,
sD                  SD,
iE-Extensions       ProtocolExtensionContainer { { S-NSSAI-ExtIEs} }    OPTIONAL,
...

}

e.g SD is NOT OPTIONAL. It is my understanding that this will be changed in the next version of the specification bu that is not yet available.

The ASN1 code of TS 38.413 15.0.0 which is what Wireshark is based on has:

S-NSSAI ::= SEQUENCE {
sST             SST,
sD                  SD,
iE-Extensions       ProtocolExtensionContainer { { S-NSSAI-ExtIEs} }    OPTIONAL,
...

}

e.g SD is NOT OPTIONAL. It is my understanding that this will be changed in the next version of the specification bu but that is not yet available.