Relates to: MC-268805 MC-268927 MC-269079 MC-269364 MC-269365 MC-269437 MC-269438 MC-269443 MC-269447 MC-269938 MC-269939 MC-270254 MC-270255 MC-270256 MC-270257 MC-270258 MC-270260 MC-270324 MC-270766 MC-273060 MC-275778 MC-276442 MC-276635 MC-276664 MC-277504 MC-277696 MC-277705 MC-277706 MC-277877
The bug
The underline displayed under text does not appear to be tied to a texture, unlike almost all other aspects of fonts.
Example underlined text
/tellraw @p {"text": "\u0020", "underlined": true}
Expected results
Underlines would have a texture file or some other configuration method such that the way it looks can be customized in resource packs.
Actual results
They do not.
Linked issues
relates to 1
Attachments
Comments 3

That does not accurately and entirely confirm the bug. That is just showcasing the underline.

Thank you for your report!
We're tracking this issue in MC-192106, so this ticket is being resolved and linked as a duplicate.
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Can confirm:
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