Space Miner fails to start mining / upgrading an asteroid.
This has been listed before (by me even) but it is happening again/still under 3A - Seems to be only when a miner uses it last point of movement onto an asteroid it does not start mining / upgrading the asteroid.
This is not consistant and I had it happen only about four times in a two hour session. Saving and reloading does not duplicate it - but I did start watching for it and in all cases it was for a miner that used it last point of movement to enter the field.
Hope that helps a bit.