Signs placed prior to 1.16.220 (see sign on the right in the screenshot) have bright colors when dye is applied. Signs placed after the update (see sign on left in the screenshot) seem to have too much transparency on the text. The text is nearly unreadable, especially at a distance. The bright, readable text is preferable, but it only works on signs that were placed prior to the update.
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We're tracking this issue in MCPE-117516, so this ticket is being resolved and linked as a duplicate.
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