Manual snapshot corrupts VM

I've been using snapshots for quite a long time (usually before doing any upgrades in VM) and all worked flawlessly. Until yesterday.
I use PVE 8.2.4 and this might be the first snapshot done after recent PVE updates.
While doing snapshot (with RAM) I noticed that its size keeps growing well over RAM's size (21 GB for 14 GB of RAM). And once snapshot is done, VM becomes almost completely unresponsive. One time I managed to log in and noticed that mysql (Percona) consumes a lot of CPU.

My...

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