I know nothing about APEX Clearing. I do know Schwab handles this situation correctly.
The 1099-B instructions to preparers is pretty clear:
"Wash sales. If a customer acquired securities that caused a loss from a sale of other securities to be both nondeductible under section 1091 and the loss was reported as a wash sale adjustment on a Form 1099-B for the sale at a loss, increase the adjusted basis of the acquired securities by the amount of the disallowed loss."
