As per VMware Compatibility Matrix we would recommend you to update the Firmware and Driver to the latest, Below mentioned is the Compatibility Guide.
VMware Compatibility Guide - I/O Device Search
If ESXi would have seen any error or some issues with the Smart Card it would have triggered an alarm.
If the error or warning is corrected then it would Auto Clear.
However it should be reported on you hardware logs for any errors and warnings.
Its always recommended to keep the hardware Firmware and Drivers Updated to the latest supported version for OS.
Since these updates would contain a lot of Fixes for errors or Known Issues.