My research so far seems to indicate the Gen2 for 2023 comes in two type - one for the US and one for the rest of the world. The world version comes fully street legal. My assumption was that to minimize supply chain issues and parts inventory they'd try and keep the builds as similar as possible and just eliminate some parts in the US version like the horn, mirrors, turn signals and license plate holder and light. Checking parts inventory in both the US and Canada doesn't turn up any differences in front or rear light assemblies, and installing the flasher and turn signal switch got the front turn signals to work. I've got the wiring diagrams for all the Gen2 and it doesn't show separate wiring harness for the US version vs the World version. Thing like the horn wiring were in place and worked. I also see wiring for the optional heater and a few other things under the dash I haven't identified yet. At this point I'm assuming there's a connector in the harness which isn't plugged in that activates the rear turn signals in both the light assembly and the trailer connector. I haven't disassembled the tail lights yet, but it appears there is a row of LEDs in them that aren't activated by the running lights or brake lights and I've assumed they must be the turn signals. So I'm still stumped.
BTW, from what I've seen in my research the Gen1 units (prior to 2023) all did have different head and tail light assemblies for units with and those without turn signals. There's only one part number for the Gen2 (2023) units for headlights and taillights and it's the same for US and non-US (Canadian) configurations. Since the headlight assemblies on my 2023 do have amber turn signal LEDs in them I'm assuming the read light assemblies also have them, but someplace they're not connected. I also checked the fuse box and there's nothing in there for only the rear lights.