Check what version of Syncthing-fork you’re running. IIRC there was a major breaking change between 1.x and 2.x, so they published a new app to make sure people only upgraded deliberately.
AFAICT F-droid hasn’t built the new app (yet?). The redirect is on GitHub’s end. You can also install older versions through F-Droid if you prefer (but not 1.x, I don’t believe those are published anymore)








I had to make that technology decision recently and decided on Zigbee. I don’t see any real advantage to Matter other than future support, and current support is much much lower than Zigbee.
The “seamless internet/cloud connection” is a massive turnoff. Products proudly advertising Matter and then hiding Thread vs WiFi is a pain. And frankly only IKEA really seems to be offering anything Matter with AU plugs and they’re super coy about it so I’m never confident about what I’m getting.