Placing down copper grates and closing up a hole that contains a liquid will cause glitched rendering.
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Linked issues
is duplicated by 2
Attachments
Comments 4

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Confirmed, Also occurred with android
Which causes the fluid with full fill with water/lava, Creates an culling except with each corners of fluids
Steps to reproduce
Create a setup from Attachments (5 x 6 blocks, dig at 3 x 4)
Fill entire the water or lava without flowing to below
Fill entire with copper grates in above of main blocks