From curseforge comment by merchantnpc4:

1.18.2 V2.0.1
wireless transmitters need a block update to send a signal after entering the game (singleplayer)
not gonna make a GitHub account for a single minor issue

edit: seems to work occasionally without block updates, can't figure out the reason

Unable to reproduce. Suspect this was related to this, dannydjdk/Tiny-Redstone#103 , which has been fixed.