Bot Framework Composer does not seem to interpret "if" well in the schema - bot-framework-composer

Question

This schema is perfectly json-validated but does not work in Bot-Framework-Composer. To be exact, when "has" is "true" the "secondFace" object MUST be set, when "has" is "false" it must be absent.
The Bot Framework Composer validates correctly if "has" is true, while if "has" is "false" it continues to request to set the "secondFace" object. Is it a composer bug or is there anything to do, perhaps at the composer's form-UI level?
"hasSecondFace": {
"type": "object",
"title": "Has second face for comparison ?",
"additionaProperties": true,
"properties": {
"has": {
"type": "boolean",
"default": true,
"title": "Has Second Face",
"description": "If true ha second face else No"
},
"secondFace": {
"title": "Second face to be compared",
"additionalProperties": true,
"required": [
"type",
"param"
],
"oneOf": [
{
"type": "object",
"title": "From Storage",
"properties": {
"type": {
"const": "fromFile"
},
"param": {
"$ref": "schema:#/definitions/stringExpression",
"title": "Storage key",
"description": "key name of the blob"
}
}
},
{
"type": "object",
"title": "image stream",
"properties": {
"type": {
"const": "fromKey"
},
"param": {
"$ref": "schema:#/definitions/stringExpression",
"title": "Stream of second face",
"description": "Second face to compare"
}
}
}
]
}
},
"if": {
"properties": {
"has": { "const": true }
},
"required": [ "has" ]
},
"then": {
"required": [ "secondFace" ]
},
"else": {
"not": { "required": [ "secondFace" ] }
}
}
}