The reason for this is precisely the use of the receipt price in many issue documents. In general, it is necessary to wait for the price changes to take effect.
For users with their own server, a potential partial solution is described below, although it will be similarly time-consuming.
Procedure for data on your own server:
Before changing the price on the receipt, it is possible to disable the warehouse recalculation triggers. After the price change, perform a manual warehouse recalculation (in the Tools module) and then re-enable the triggers.
General SQL: alter table dpolsklad disable trigger user
Note: While the triggers are disabled (i.e., during the above-mentioned process), no other users may be connected (i.e., no other work may be performed in Flexi).