Pretty much just the title.

Hop into a spidertron and do something with the construction drones. They'll happily deploy and go do their job, but they won't get back in.

https://imgur.com/a/9lu1KhO

I think this is an issue related to the hitbox size. You can walk over them to pick em up

I noticed the same when I am in a car. Not sure if this is expected behaviour

This fix worked for me:

Open the construction_drone.lua

Change the line 1234 to:

"if distance(drone.position, player.position) < 2 then"

You maybe have to increase that value further to work with the spidertron. I've only tried it out with a car.
I also haven't fully tested it but I think it works.

I also noticed starting with v1.0 that the drones don't return to you when you are in the car. This worked in beta .18 versions.. It is annoying to have to get out to pickup your drones...