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In case anyone else searches this error.
Same symptoms for UDP traffic passing over VPN being silently dropped on arrival after decrypt but zdebug:
@;1531076470.3303760;[vs_0];[tid_40];[fw4_40];fw_log_drop_ex: Packet proto=SRC:6440 -> DST:6440 dropped by vpn_dec_verify_mspi_failure_sxl_notification_handler Reason: decrypt mspi is not valid;
Same SRC and DST using different ports worked so was not a VPN issue.
Matching Connections flushed from table and connectivity restored.
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