The oak, crimson, and warped sign item textures have inverted colors for the text

The colors of the text on the oak, crimson, and warped sign textures are inverted, making the text look like an indentation/carving into the sign rather than text on top of it. While the crimson and the warped signs may be a special case considering they are both nether woods, the oak sign is especially strange considering (almost*) no other overworld signs have inverted colors

Vanilla vs. Expected:

Notes:

The "(almost*)" was put in the description, because dark oak is a special case with sign textures since it also has an inverted brightness for the sign text. It is not as unusual for the dark oak sign.