[MCPE-166418] The text background opacity slider doesn’t work.

As the summary implies, the text background opacity slider still doesn’t work. I thought this bug was resolved in 1.19.50?

Here is the link because the video was too large: https://1drv.ms/v/s!AmQfJZCa_fpjbqwLvBeO6F17SmU

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We're tracking this issue in MCPE-79331, so this ticket is being resolved and linked as a duplicate.

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