Bottom of iron bars Z fight when placed on top of another block, and also Z fight on the top when a block is placed above it and when viewing from underneath.
Vanilla Tweaks has a texture pack under the fixes section which fixes this issue by moving the top and bottom faces of iron bars away from the block a bit, so that they don't touch and cause Z fighting. https://vanillatweaks.net/picker/resource-packs/
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Please check if updating your GPU driver fixes the issue.

Updating GPU driver does not fix this. I'm using a GTX 1050 Ti if that's the case.

I have this z-fighting issue too. So annoying!
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 21w13a.

Can confirm in 21w16a.

Can confirm in 21w17a.

Can confirm in 21w18a.

Can confirm in 21w19a.

Can confirm in 21w20a.

Can confirm in 1.17 Pre-release 1.

Clone of MC-220

Can confirm in 1.17 Pre-release 2.

Can confirm in 1.17 Pre-release 3.

@unknown, your Nvidia driver shown in the video attached is version 430.86, which was released in late May 2019. I'm using 466.11, which was released in mid April 2021, and I cannot reproduce this issue. This driver version is also compatible with GeForce GTX 1050 Ti.
I can only experience this issue when using Optifine, but not vanilla (even without resourcepacks enabled). Please check again if a driver update fixes this.
Can confirm in 1.17.

Cannot reproduce in 1.17.1 Release Candidate 2.

Can confirm in 1.17.1.

Can confirm in 21w39a.

Can confirm in 21w40a.

Can confirm in 21w42a.

Can confirm in 21w43a.

omg please someone fix this is so annoying

21w44a,
please fix this bug, it is frustrating

Can confirm in 1.18 and 1.18.1 Pre-release 1.
Can confirm in 1.18.1.

Can confirm in 1.18.2.

Can confirm in 22w18a.
Can confirm in 1.19.2.

Confirmed in 1.19.3

Can confirm in 1.19.4

Confirmed in 1.21.3

Confirmed in 1.21.4
I am unable to reproduce this, please provide a screenshot of it occurring with your F3 debug screen enabled.