The way workers are being reported - both on the owned planet page and on the system scans - is very confusing and totally not practical. Always having to add the reported number of workers with the number of occupied workers isn’t a good idea at all.
IMHO should be the total number of workers, and the number of occupied workers.
Both numbers offer useful information. Best would be Total number; Occupied; Available for tasks - a 3 number system if it’s to make it really helpful.