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You are not fixing the issue which is having wrong inputs and/or outputs so the cache works without any issue

To start with,

--rerun

would be better on recent versions, because it only force-runs the given task, not all tasks. To not need it, either as Javi said properly define the inputs and outputs of the task, or if you cannot or do not want to, use

@UntrackedTask

or

doNotTrackState()

to disable up-to-date checks and caching.