VMware vSphere ESXi
VMware vCenter Server
This behavior is by product design.
When a system log export is performed with only the "Base" option specified, various system log files stored in the ESXi host's scratch partition are excluded from the collection.
To comprehensively collect the required log files, please generate the log bundle using the default settings without deselecting any options.
For detailed steps, refer to "Export System Log Files".