I read this issue happened before but find no solution about it. I have an excavator on the list but it is not there. And not working when assigned. It seems like it is underground or something. I didnt check my trucks has the same issue because they are too many to figure out if they are missing or not. Also because i cant click the excavator, I cant pause it. Dont know if it use diesel as well.
Hope you fix this issue asap.