Changing sign glowing flag or text color is purely client‑side rendering change with no block state modification and no light source emission. However this operation triggers full block update and light recalculation for the whole chunk section on server. On chunks with corrupted lighting cache, this bug will produce high mspt and severe server lag. Removing those problematic signs immediately restores server performance.
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We're tracking this issue in MC-226966, so this ticket is being resolved and linked as a duplicate.
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So this reduces productivity?