This is not any ESXi bug. The snapshot file continues to grow in size when it is retained for a longer period. This can cause the snapshot storage location to run out of space and impact the system performance. Do not use a single snapshot for more than 72 hours is what as recommended (https://kb.vmware.com/s/article/1025279)
Are you getting the consolidate option in snapshot manager? If yes, any error messages in the consolidate process?
Also please share the output for (grep vmdk *.vmx) from the VM folder.
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Although I am a VMware employee I contribute to VMTN voluntarily (i.e., not in any official capacity)
