Minecraft wiki entry for Development_versions, associated text: Light blocks are now visible when holding another, and also show brightness value (MCPE-123249)
Fixed Light Block not being removed when left-clicking it while holding a Light Block (MCPE-123258)
Fixed Light Block brightness not being adjustable when right-clicking it (MCPE-123387)
Fixed Light Block hitbox issue (MCPE-135277)
Fixed Barrier Block being destructible whilst not holding a Barrier Block
Boats now disappear from inventory correctly after placing it on water in Survival mode (MCPE-136445)