Hello,
I m on version 18.4 and I have the same issue. It’s a bug identified by Odoo. A solution could be : Change the route MTO, change the rule’s replenishment method : WH to customers from : take from stock, trigger another rules to take from stock only.
Hope it will help you !
could you please share more details regards this like configuration, MTO or reordering rules or actual use case so we can identify issue