Opening a shipbuild and paying the fee to unlock stock modules on a build immediately deducts the fee from your credits but if the game is closed in this state without properly exiting the build, the changes to it are not saved and after reopening the game the price stays deducted but all of the locked modules are back on the shipbuild.
It would be better if the game deducted the price at the same time build changes are saved on a proper exit, rather than immediately.
Opening a shipbuild and paying the fee to unlock stock modules on a build immediately deducts the fee from your credits but if the game is closed in this state without properly exiting the build, the changes to it are not saved and after reopening the game the price stays deducted but all of the locked modules are back on the shipbuild.
It would be better if the game deducted the price at the same time build changes are saved on a proper exit, rather than immediately.