Entity Upgrades
It seems like an entity isn't upgrading, when it should have by now.
First check if the mod is tracking the entity. To do that, mouse over the entity so that it's highlighted, and then hit Shift-Control-Q: that will give clear feedback if the unit is tracked. If it's tracked, then you will get a small dump in the console with its current status. It should just be a matter of waiting.
If the mod isn't tracking the entity, try running the console command quality-control-init
and waiting a few seconds, then check it again with shift-control-q to see if it was added.
If all that fails, then let me know! It might be that another mod added an entity type that isn't supported yet. I would need to know the mod name at least, and it would be helpful to get the entity-type name. Factorio has a built in command "open prototype explorer gui", I set mine to control-shift-f or control-p, not sure what the default is. if you mouse over a unit and press that it will show a detailed breakdown, including its "unit-type."