I think the problem is with the following union in your schema:
"type": [{ "type": "array", "items": "TransactionStaticComponent" }],
"default": "null"
The union only has one type, that of the array, and does not also include
"null" which is necessary for the default value of null to be valid. The
following might be worth a try:
"type": [{ "type": "array", "items": "TransactionStaticComponent" },
"null"], "default": "null"
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