MongoDB doesn't group properly - mongodb

Question

I am using mongoDB with .NET and for over a year, the same query worked properly.
For a single date range - 04.06.22. - 05.06.22. query malfunctioned and didn't group only one product by ID, so I am getting 2 products with the same ID.
Query (will delete unnecessary params, to make it easier to understand):
.FilterByCustomer(filter.CustomerId)
.FilterByTerminals(filter.Terminals)
.FilterByDateRange("FromLocalDateTime", "ToLocalDateTime", filter.LocalDateRange)
.Unwind("SalesForSingleProductReports", false)
.Unwind("SalesForSingleProductReports.RevenueAndSalesPerCurrency", false)
.Group(
#" _id : {
ProductInfo: '$SalesForSingleProductReports.ProductInfo',
CurrencyInfo: '$SalesForSingleProductReports.RevenueAndSalesPerCurrency.CurrencyInfo'
},
RevenueAndSalesPerCurrency: {
$push: {
Revenue: {$sum: '$SalesForSingleProductReports.RevenueAndSalesPerCurrency.Revenue'},
}
}
}")
.Group(#"_id : '$_id.ProductInfo',
RevenueAndSalesPerCurrency: {$push: {
CurrencyInfo: '$_id.CurrencyInfo',
Revenue: {$sum: '$RevenueAndSalesPerCurrency.Revenue'},
}")
.Project(#"_id:0,
ProductInfo:'$_id',
'RevenueAndSalesPerCurrency': 1")
.Compile();
The result that I am getting is multiple products, but one is duplicated and has different revenue values, but same ID:
[{
"productInfo": {
"productId": "id-111",
"productName": null,
"productInternalCode": "internal-111",
"productCategoryId": "prod-cat-111",
"productCode": null,
"brand": null,
"countryCode": null
},
"revenueAndSalesPerCurrency": [
{
"currencyInfo": {
"currencyId": "curr-Id",
"code": "EUR",
"symbol": "€"
},
"revenue": 1680,
}
]
},
{
"productInfo": {
"productId": "id-111",
"productName": null,
"productInternalCode": "internal-111",
"productCategoryId": "prod-cat-111",
"productCode": null,
"brand": null,
"countryCode": null
},
"revenueAndSalesPerCurrency": [
{
"currencyInfo": {
"currencyId": "curr-id",
"code": "EUR",
"symbol": "€"
},
"revenue": 3080,
}
]
}
]
Here's one record from the collection on which actions are done:
"_id" : ObjectId("id-string"),
"CreatedAt" : ISODate("2021-11-10T10:14:10.116Z"),
"UpdatedAt" : ISODate("2021-11-10T10:14:10.116Z"),
"CreatedByUserId" : null,
"UpdatedByUserId" : null,
"Version" : null,
"IsDeleted" : false,
"ReportType" : "AggregatedSingleProductSalesReportForTerminalAndDate",
"ReportId" : "report-id,
"CustomerId" : "cust-id",
"FromUtcDateTime" : ISODate("2021-11-01T23:00:00.000Z"),
"ToUtcDateTime" : ISODate("2021-11-02T22:59:59.999Z"),
"FromLocalDateTime" : ISODate("2021-11-02T00:00:00.000Z"),
"ToLocalDateTime" : ISODate("2021-11-02T23:59:59.999Z"),
"TransactionIds" : [
"trans-id-1",
"trans-id-2",
],
"TerminalId" : "terminal-id",
"LocalDate" : "2021-11-02",
"SalesForSingleProductReports" : [
{
"ProductInfo" : {
"ProductId" : "prod-id",
"ProductName" : null,
"ProductInternalCode" : "internal-string",
"ProductCategoryId" : "prod-category-id"
},
"RevenueAndSalesPerCurrency" : [
{
"CurrencyInfo" : {
"CurrencyId" : "euro-curr",
"Code" : "GBP",
"Symbol" : "£"
},
"Revenue" : 180,
}
]
},
{
"ProductInfo" : {
"ProductId" : "prod-id-2",
"ProductName" : null,
"ProductInternalCode" : "internal-string-2",
"ProductCategoryId" : "prod-category-id-2"
},
"RevenueAndSalesPerCurrency" : [
{
"CurrencyInfo" : {
"CurrencyId" : "euro-curr",
"Code" : "GBP",
"Symbol" : "£"
},
"Revenue" : 90,
}
]
}
]
}```