Question about lowering the render distance

Hello I've my render distance at 4k chunks (Picture) I want to lower them so you can see cleanly the Island without these ugly shaped barriers (cuz I don't loaded the chunks clean at the outside) but I'm scared that when I do that and then turn the chunks high again it has to render them all again (this happened to me last time I'd it ) is this bug already patched or smth AKA: can I do that without being scared?
ipisGBk.png
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