Product disappears from excavator.

Issue description

materials are missing from the mega excavator.
when the mega excavator digs up and stores in the bucket, for example, earth ore rock. and if the bucket is not full, at that moment he is waiting for a truck to empty, for example, 13 stone units. but if the machine does not arrive at that time, you will remove the digging mode for the square that you have already finished digging. He goes to the next square and digs a new one to finish the work, but that bucket is the new material from the new square, but the material from the previous square has already disappeared.

Reproduction steps

1. mark the place where to dig at least 2 squares.
2. when the excavator digs xx units under max capacity. before truck picking up.
3. remove the finished work from 1 square.
4. the excavator will go to the next square and finish the next square.
5. the previous material from 1 square will disappear. and from the 2nd square that was dug, it will be inside the bucket.

6!!! in this process, do not let the truck pick up the material.

Game version and build number

v0.5.5D B259

Operating system

Windows

Attachments

It also disappears if you pause the excavator or manually order to move.

I like to abuse this in the early game for the excavator to remove boulders without needing a truck or dump site. And it does not cost unity.
Good usecase example is the obstacle in crater start Rain sound pan left-right heavily affected by map rotation to get to the coal.