Disk Space usage incorrect

[Raxjinn]

When sending the disk space usage values for the operational data, the percentage used is correct but the value used is incorrect. When the OK alert comes in, the value of the previous disk usage before the alert is what is shown. I take it this is by design of the {ITEM.LASTVALUE3} or am I missing something?

First Alert
Operational data: Space used: 50.9 GB of 84.66 GB (92.03 %)

OK Alert
Operational data: Space used: 77.91 GB of 84.66 GB (60.12 %)