When you put a block of glass or ice in a puddle of water, the glass and ice disappears!
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[media][media]
This issue is marked for a fix in a future version update.

Also happens to end gateways

Possibly relates to MCPE-11140 and/or MCPE-11141

Affects 1.2.15

Affects 1.2.16

Affects 1.4

One of the Bedrock versions of MC-9553.
Seems to be fixed.