Error: Circular dependency detected in template language expression

[jejass]

[Template Name goes here](Template link goes here)

Issue Details

My template
`{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"recommendationSeverities": {
"type": "array",
"defaultValue": [ ]
}

},
"functions": [],
"variables": {
"recommendationSeveritiesLength": "[length(parameters('recommendationSeverities'))]",
"ruleSetsForAssessmentsObj": {
"copy": [
{
"name": "ruleSetsForAssessmentsArr",
"count": 1,
"input": {
"rules": [
{
"propertyJPath": "properties.metadata.severity",
"propertyType": "string",
"expectedValue": "[parameters('recommendationSeverities')[mod(div(copyIndex('ruleSetsForAssessmentsArr'),1),variables('recommendationSeveritiesLength'))]]",
"operator": "Equals"
}
]
}
}
]
},
"sourcesWithoutSubAssessments": {
"copy": [
{
"name": "sources",
"count": 1,
"input": {
"eventSource": "[variables('ruleSetsForAssessmentsObj').ruleSetsForAssessmentsArr]"
}
}
]
}
},
"resources": [
{
"name": "dfasdfdasfasde",
"type": "Microsoft.Storage/storageAccounts",
"apiVersion": "2021-04-01",
"location": "eastus",
"kind": "StorageV2",
"sku": {
"name": "Premium_LRS",
"tier": "Premium"
}
}
],
"outputs": {}
}`

Repro steps (if necessary, delete otherwise)

1. deploy the template.
2. it will report error of 'circular dependency' while there is no circular dependency.