With Open VM tools (open-vm-tools) version older than 10.2.0, taking a quiesced snapshot on a Linux VM succeeds but shows up as a non-quiesced snapshot.
In VMware logs, it shows that quiesce snapshot was successfully taken.
VMware.log
2024-08-27T08:39:36.159Z In(05) vmx - SnapshotVMX_TakeSnapshot start: 'VM Snapshot 00/00/2024, 00:00:00 AM', deviceState=0, lazy=0, quiesced=1, forceNative=0, tryNative=0, saveAllocMaps=0
2024-08-27T08:39:36.159Z In(05) vmx - 2114362:VVOLLIB : VVolLib_IsVectoredSnapSupported:14277: VVolLib_IsVectoredSnapSupported: vvolVectoredSnapEnabled: 1
.....
2024-08-27T08:39:38.612Z In(05) vcpu-0 - ToolsBackup: changing quiesce state: COMMITTED -> FINISHING
2024-08-27T08:39:40.614Z In(05) vmx - ToolsBackup: changing quiesce state: FINISHING -> IDLE
2024-08-27T08:39:40.614Z In(05) vmx - ToolsBackup: changing quiesce state: IDLE -> DONE
2024-08-27T08:39:40.650Z In(05) vmx - SnapshotVMXTakeSnapshotComplete: Done with snapshot 'VM Snapshot 00/00/2024, 00:00:00 AM': 850
2024-08-27T08:39:40.650Z In(05) vmx - VVolObjNotifySnapshotDone: isEnabled: 1
VMware ESXi Version: 7.x
VMware ESXi Version :8.x
Kindly update the VMware tools to 12.x or later version.
Refer following doc for how to install/update Open VMware tools on Linux distributions.
Install Open VM Tools (vmware.com)