As being the 'is_tx = 0' can't be moved in the entire handler as a result of a doable race involving the delay in switching to STATE_RX_AACK_ON plus a new interrupt, we introduce an intermediate 'was_tx' boolean just for this purpose. There is absolutely no Fixes tag implementing listed here, https://astra-pro38260.ageeksblog.com/28031155/a-simple-key-for-wordpress-and-plugins-unveiled