What is the principle (process) of Hyper-V merge snapshot (differential disk)?

As the title, Hyper-V is creating multiple checkpoints (such as T1, T2 and T3). When I delete the T2 checkpoint, how is the difference disc (avhdx) generated at T2 merged? Even delete all checkpoints? How is it merged? In the process of merging, how do
Hyper-V, VSS, etc. work?

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