A couple of days ago, I had received an email from a customer that after upgrading to ESXi 8.0, they were no longer able to attach an existing virtual disk (VMDK) to a VM using the ESXi Host Client, which is accessible by opening a browser to the Hostname/IP Address of your ESXi host.
After selecting the desired VMDK to attach in ESXi Host Client wizard, the customer had noticed several fields were not populated as shown in the screenshot above and the workflow would not be allowed to complete as these fields are required.
Note: This issue also affects ESXi 7.0 Update 3i and potentially other newer releases, if they also contain the 2.x version of the ESXi Host Client. One workaround, which I have personally verified with ESXi 7.0 Update 3i is to uninstall the bundled esxi-ui VIB and install the prior version by downloading the ESXi offline depot (zip) for ESXi 7.0 Update 3g. While this may not be officially supported, for those that have a standalone ESXi host or using the Free ESXi version, this may be an acceptable workaround until a fix is available in a future patch/update. For detailed instructions, see my reply on this VMTN thread.