Lighting Graphical Artifacts appear when playing with shaders

How do you "play" with shaders?
Do you use the new experimental Deferred mode toggle, or standard RTX resource pack? If RTX pack, what pack exactly?
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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