How to perform join in linq when implementing multi tenants with separate databases in ABP framework

Question

I'm implementing multi tenants (separate databases for each tenant) in ABP framework with following architect:

1. Host: Server 1
2. Tenant 1: Server 1 (the same with host)
3. Tenant 2: Server 2

In Application layer, I have a method like this:

public async Task<List<ODDetailDto>> GetListAsync(string value)
{
    var formData = new ODDetailFilterDto();
    if (!string.IsNullOrEmpty(value))
        formData = JsonConvert.DeserializeObject<ODDetailFilterDto>(value);
    var queryODDetail = await _odDetailRepository.GetQueryableAsync();
    var queryRemit = await _remittanceTransactionRepository.GetQueryableAsync();
    var queryStatus = await _statusRepository.GetQueryableAsync();
    var query = await AsyncExecuter.ToListAsync(
        from a in queryODDetail
        join b in queryRemit on a.ODRMTTransactionId equals b.Id
        join c in queryStatus on a.VitalStatusId equals c.Id into ac
        from acResult in ac.DefaultIfEmpty()
        where
        (formData.CustomerAbbr != null ? b.CustomerID == formData.CustomerAbbr : true)
            && (!string.IsNullOrEmpty(formData.ODRefNo) ? b.ODRefNo == formData.ODRefNo : true)
            && (formData.ODDate.HasValue ? b.ODDate == formData.ODDate : true)
            && (formData.ODFinalDue.HasValue ? b.ODFinalDueDate == formData.ODFinalDue.Value : true)
            && (formData.ODFinalRate.HasValue ? b.InterestRateFinalRate == formData.ODFinalRate.Value : true)
            && (!string.IsNullOrEmpty(formData.RMTAMTCCY) ? b.RMTCCY == formData.RMTAMTCCY : true)
        //&& (!string.IsNullOrEmpty(formData.LoanPurpose) ? b.purpo == formData.LoanPurpose : true)

        select new ODDetailDto
        {

            Id = a.Id,
            Amount = b.ODAmountAmend.HasValue ? b.ODAmountAmend : b.ODAmount,
            Repayment = a.Event != "OD" ? a.Amount : null,
            Balance = (b.ODAmountAmend.HasValue ? b.ODAmountAmend : b.ODAmount) - (a.Event != "OD" ? (a.Amount.HasValue ? a.Amount.Value : 0) : 0),
            BookingType = a.BookingType,
            SystemRefNo = a.SystemRefNo,
            VitalRefNo = a.VitalRefNo,
            Cost = b.ODTRCost,
            Event = a.Event,
            EventDate = a.EventDate,
            Spread = b.ContractSpread,
            FinalRate = b.InterestRateFinalRate,
            VitalStatusId = a.VitalStatusId,
            VitalStatusName = acResult.StatusName
        }   
    );
    return query;
}

When I run on Tenant 1, it's OK, but not for Tenant 2 with following error:

Cannot use multiple context instances within a single query execution. Ensure the query uses a single context instance.
System.InvalidOperationException: Cannot use multiple context instances within a single query execution. Ensure the query uses a single context instance.

I don't know why because queryODDetail, queryRemit and query are on the same DbContext. Could you please tell me why? Thank you.