In order to resolve this issue, update to ESXi 8.0 Update 2b, build 23305546, or newer.
Workaround:
The recommendation is to only extend a VMDK when the virtual machine is in a powered-off state.
If the Hot-Extend operation has already been completed:
1. Perform a virtual machine operation that will cause the VMDK to be internally re-opened. This includes power-on and power-off tasks, snapshot operations, suspending and resuming the virtual machine, or hot-removing and hot-adding the VMDK.
2. Reset CBT and complete a full backup immediately. Note: This action does not fix the pre-existing backups.