The block selection outline becomes thicker with wider resolutions

Can confirm in 23w51b. This behavior also applies to any lines rendered via shaders, such as entity hitboxes (F3 + B), or chunk borders (F3 + G).

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We suspect that this does not occur in the latest version of Minecraft.

Is this issue present in the latest version of Minecraft?

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still happens with 26.4 snapshot 5
2560x1440: 3-4 pixel line width
3440x1440: 4-6 pixel line width
5120x1440: 6-8 pixel line width

also still happens with 26.4 snapshot 6