Strangely, the release is still called 'alpha' everywhere - About dialog, download page... Why?

I've seen it too.

This thing is actually not so hard to reproduce:

Have a non-stack inserter bonus researched, so the default stack size for the burner inserters will be 2.
Place a chest, a burner inserter and a turret next to each other, just like in the picture by the OP.
Put a stack of ...

If you have time, could you please add support for Transport Group mod by Schallfalke?

All it does is a new separate tab for all vehicles and vehicle-related items (like rails). The change should be trivial, like using this at the start of items.lua:

-- Add electric train subgroup
local train ...

Bug: in Factorio 0.17.36, scanning radar is drawn with a glitch. On certain zoom levels only, the radar dish gets stuck pointing south (down). Doesn't happen to vanilla radars. The upper radar is vanilla, the lower one is (glitching) scanning.