Hi, I've just bumped on this error also, my latest VMWare server just lists manufacturer, model, serial number and little else...
But in my case, I have three equal machines (HPE DL380 Gen9) that we've bought some months ago, the first two whrere installed on the end of October 2017, and those do not have issues, they list everything on Lansweeper...
Now I've installed the third one, and this one has the bug... they all have the same BIOS, the VMWare version is the same (VMware ESXi 6.5.0 build-5969303 VMware, Inc. x86_64, the HPE version), etc.
Running the VMWare debugger I can get a list of all information, so it really seems an issue with LS itself...