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I think the FTL has a newer version

@FurkanVG

FTL
    Version is vDev-1dbd955 (Latest: null)
    Branch is development-v6
    Hash is 1dbd9556 (Latest: 10e98d1d)

try pihole -up.

I haven't updated myself yet but it supposed to have a workaround

@DL6ER

You will find a new option ntp.sync.active which you can easily set to false to prevent any syncing from happening.