Magento 2 MSI not updating the salable Quantity Properly and thus customer can order more product than actual available stock.

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Hi Am facing a Tricky issue on Magneto 2.3.3 Opensource edition .

** Preconditions **

1 Magneto 2.3.3 .
2 Multi Store enabled .
3 Multi inventory enabled.
4 Fresh Magneto installed without any custom plugins .

** Summary **

When an inventory is shared among two or more stores the purchase of a product from the store should update the salable quantity of product among other stores which the inventory is shared .
The issue is as follows (Explained with an example for ease of understanding ) :

I have Two stores on an magneto admin say Store X and Store Y , one for county X and other for country Y .

I have also 2 Separate Inventory (representing my 2 physical warehouse ) Say Inventory-X and Inventory-Y.

The Store X has access to two inventories Inventory-X and Inventory-Y .
Where as .
The Store Y has access only access to Inventory-Y .

Now I have a product Test Which is available on both stores . and on Inventory-X it is of quantity 10 and on Inventory-Y it is of quantity 5 .

That is on Store X salable quantity of product Test is 15 and on Store Y salable quantity of product Test is 5 . It is initially correctly set by Magneto Without any issues.

Now comes our real issue :

Now suppose a customer orders 15 product from Store X Then Magneto updates the salable quantity of Store X with 0 , but not updating the salable quantity of Store Y as 0 , which is logical , and thus this allows another customer to place order 5 product Test from Store Y ,Which has already been sold out through Store X .

**Steps to reproduce**

1 Create Two Stores on am admin Store-1 , Store-1 .
2 Create two different inventories inventory-1 ,inventory-2.
3 Assign stock as follows :- store-1 with inventory-1 and inventory-2 . store-2 with inventory-1 only .
4 Create a product P1 and assign inventory-1 quantity =10 and inventory-2 quantity =5 enble this product for both store-1 and store-2.

5 order 15 products from store-1 .
6 you will also be able to order another 5 product from store-2 , which is not expected.

**Expected result**

After First Customer done the purchase salable quantity of Store-1 and Sore-2 should have been set as zero , thus not allowing any more purchases on both sores .

**Actual result**

Salable Quantity of Store-1 only got updated , Salable quantity of Store-2 remains the same thus allowing 5 more product P1 to be purchased from store-2 .

Start with the reproduction steps: configure two stores and inventories, assign the shared product quantities, and place the order from store-1. Compare salable quantities for both stores after the order, then trace the inventory update flow to determine why store-2 remains orderable. Done means both stores report zero salable quantity and reject the additional purchase.

Written by the indexing model from the issue text.