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As of the 1.16 Texture Pack update that was release on Bedrock (Xbox) today for PureBdcraft the Icon for being hit with an arrow of Slowness is not longer a Ball & Chain, but what appears to be a Texture Map.
Photo Attached.
Official bug report: https://bugs.mojang.com/browse/MCPE-65491
Note by HanFox: It's been discovered that putting the UI pack above the main PureBDcraft pack will workaround this issue.