Mo and Krill got a buff at some point which gave him zoomed out vision in his dig. This was suddenly removed from the game without any patch note about it. This feature was really useful to properly see dig's radius around Mo.
This is how it looked after the buff:
This is how it looks currently:

Valve, can you please bring this feature back? ༼ つ ◕_◕ ༽つ
This is how it looked after the buff:
This is how it looks currently:

Valve, can you please bring this feature back? ༼ つ ◕_◕ ༽つ