Based on a bug fixed in the Java Edition Snapshot 19w40a - MC-161905
The bug showed signs with glowing text, now yes this was a bug with all dyes,
but why not attach this effect to Signs if Glowstone Dust is used as a sign dye.
It would be good for signs in dark mazes or caves and similar, and as the bug showed
it is possible for sign text to glow.
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