I have a Garmin panel in my FX-3 with a G3X (GDU 465) display, a GNC 355 navigator, and a remote GTX 45R transponder. Since delivery in November 2022, it was clear that there was a problem with the TIS-B traffic display on the GNC 355. The problem was described in Garmin Service Advisory 23023 Rev A.

I'm happy to report that today Cub Crafters updated my transponder software to ADSB SW to version 3.41 in conjunction with the 2.80 main SW, and that has solved the problem.