Palantir Technologies Inc.’s stock fell more than 8% on Friday following a report that its battlefield communications system, along with that of defense tech firm Anduril Industries Inc., was seriously flawed — a claim both companies said was out of date and inaccurate.  In a statement Friday, Palantir said that issues in the report, published by Reuters, had already been addressed. The report centered on a September Army memo expressing concerns over Anduril’s NGC2 prototype system, which stands for Next ...