Filtering for manufacturerId does not work when scanning

[elsni]

I try filtering device scan for manufactuerId.

this._bluetooth.startScanning({
            filters: [{manufacturerId:1212}],
            seconds: 4,
            skipPermissionCheck: false,
            onDiscovered: function (peripheral) {
              console.log("found device " + peripheral.localName + " mac " + peripheral.UUID + " Man.Id " +peripheral.manufacturerId);
            }
})

but the scan returns all devices.

[farfromrefug]

@elsni there is no filter by manufacturerId.
On iOS there is only a filter by serviceUUID
On android: serviceUUID, deviceName, deviceAddress, manufacturerData