Checked this link: https://moneroblocks.info/api/get_transaction_data/4adb55cde1ffcc0ea639b6718355c48c0e574000306d95ef857e55d91ddabcf2
I could not find the encrypted mask value.
I believe the encrypted amount is in the ecdh part:
"ecdhInfo": [
{
"amount": "f350bbedb3a4a93b"
},
{
"amount": "c2005984b560da47"
},
{
"amount": "6a2a649c8322d6e1"
},
{
"amount": "0e0c6e72d16779c7"
}
],