Terraform split subnets between 2 route tables

I have created a large amount of azure subnets with terraform, but i need to split them all between 2 route tables.

Currently i have my code like this, but of course the output from the resource is not a list, but objects.

resource "azurerm_subnet_route_table_association" "subnet-to-rt1" {
  for_each       = tolist(chunklist(azurerm_subnet.subnets, 255)[0])
  subnet_id      = (chunklist(azurerm_subnet.subnets, 20)[0])[each.key].id
  route_table_id = module.spoke.route_table_1
}

resource "azurerm_subnet_route_table_association" "subnet-to-rt2" {
  for_each       = tolist(chunklist(azurerm_subnet.subnets, 20)[1])
  subnet_id      = (chunklist(azurerm_subnet.subnets, 20)[1])[each.key].id
  route_table_id = module.spoke.route_table_2
}

Edit: Code to generate the subnets for clarity of the problem. I provide the var.spoke_cidr in an slash /18 range to get /27's

resource "azurerm_subnet" "subnets" {
  for_each             = toset(slice(cidrsubnets(var.spoke_cidr, [for v in range(20) : 9]...), 2, length(cidrsubnets(var.spoke_cidr, [for v in range(20) : 9]...))))
  name                 = "az-subnet-${index(slice(cidrsubnets(var.spoke_cidr, [for v in range(20) : 9]...), 2, length(cidrsubnets(var.spoke_cidr, [for v in range(20) : 9]...))), each.key)}"
  resource_group_name  = module.spoke.azure_rg.name
  virtual_network_name = module.spoke.vnet.name
  address_prefixes     = [each.value]
}

The error code im getting for each route table association resource is

Invalid value for "list" parameter: list of any single type required.

Does anyone know how i can fix this route table associations Thanks!



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