In 1.17, Java introduced Light Block to match Bedrock on the parity side. In the following snapshots, the texture of Light Block changed but on Bedrock Edition it never got updated.
MCPE-152401
Light Block item is not matching Java Edition textures
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Multiple
Windows 10, PlayStation 4 latest software update
1.18.10
Retrieved
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We're tracking this issue in MCPE-127479, so this ticket is being resolved and linked as a duplicate.
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