Underlines in chat intersect each other, causing an ugly effect when fading

I'm assuming you're talking about underlined text, not the underscore.

This is not a problem with underscores, it's a problem with underlined text.

Can confirm for 1.13-pre4, however.

Still in 1.14 Pre-Release 1

Still in 1.14 pre-3, 1.14 pre-4 and 1.14 pre-5

Still in 1.14 Release

Can confirm in 1.18.2.

Can confirm in 1.19 and 22w24a.

Can confirm in 1.19.2.

Thank you for your report!
We're tracking this issue in MC-108323, so this ticket is being resolved and linked as a duplicate.

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We're resolving this ticket as a duplicate of MC-108323 after some internal discussion since it's the same issue. 🙂