So, something is behind this.  Iran does not release a hostage without a reason.  “Fariba Adelkhah: French-Iranian academic temporarily released in Iran,” BBC, October 3, 2020.

“Police seize over 1 ton of opium in SE Iran,” Mehr News Agency, October 3, 2020.

“Khamenei Representatives Declare Support For Azerbaijan In Nagorno-Karabakh Conflict,” Radio Farda, October 3, 2020.

“Protestors In Northern Iran Demand Closure Of Border With Armenia Over Arms Transfer To Yerevan,” Orkhan Jalilov, Caspian News, October 3, 2020.

“The Islamic Republic of Iran deployed beefed-up patrols of the notoriously brutal Basij forces in Tehran and in the Khuzestan province following the regime’s September 12 execution of the wrestling champion Navid Afkari.”  See “Iranian regime security forces expanded after execution of wrestler,” Benjamin Weinthal, Jerusalem Post, October 3, 2020.