AFAIK it does not matter because it just opens the network to let a new device join.
I had a problem pairing my new FYRTUR in 2.26.3 and solved it by deleting the device-specific DDF (which was also removed in the latest beta) and so used the blind.json. Maybe that works for you, too? See FYRTUR - /battery device is not created - #12 by jan666. For you it’s /usr/share/deCONZ/devices/ikea/tredansen_block-out_cellul_blind.json (you can always restore it from here: deconz-rest-plugin/devices/ikea/tredansen_block-out_cellul_blind.json at v2.26.3 · dresden-elektronik/deconz-rest-plugin · GitHub)