NAV Query very slow, LOOP JOIN seems to be a problem

Hello experts,

Here is a mistery.

I have table with 113 records, let's name it SomeEntries.
Then I insert copy-past ~5 000 records to it (I need to test the performance).

Then I create NAV Query:

Sales Invoice Header / SomeEntries - linked on No.= Document No. with option <Use Default Values if no Match>
I run the query and it takes minutes to complete. As a comparison I created SalesInvoiceHeader/SalesLines query and it runs much faster.

SQL MS Studio Actiivity Monitor shows that query is SELECT TOP 1000 ... bla-bla.. OPTION(OPTIMIZE FOR UNKNOWN, FAST 50, FORCE ORDER, LOOP JOIN).
When I try to run the query, and comment parts out, the problem seems to be LOOP JOIN. Without it it runs much faster.

It seems that problem might be that i recently added so much entries to that table. I updated statistics and even rebuild index on SomeEntries table. But this does not help.

Somebody has any thoughts what else can I do to make NAV Query work normally, please?