https://wccftech.com/unc0ver-jailbreak-bug-could-auto-update-your-iphone-to-ios-13-5-1-heres-what-you-have-to-do/

Yesterday, Apple released its latest iOS 13.5.1 update to all users that carried important security updates. It was unveiled that Apple patched the 0-day vulnerability which was used by Unc0ver for their jailbreak tool. However, if you want to keep your jailbreak status alive on your iPhone, you should turn off iOS 13's automatic update feature immediately. This is due to the fact that a bug in Unc0ver jailbreak does not behave according to the auto-update preference.

As per the latest, Pwn20wnd of Unc0ver team confirmed on Twitter that the latest Unc0ver version carries a bug that doesn't play nice with the automatic update preference. What this means is that even if you have the auto-update feature turned off, your iPhone could still potentially update itself on its own.