Very hard to get a screenshot so here is how to reproduce
Firstly, place a rail on a face up, facing sideways, or facing downwards shulker box.
Secondly, open this shulker box.
The rail does not break.
This only happens with Shulker Boxes, and nothing else.
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We're tracking this issue in MC-110400 and MC-154699, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-154699 and MC-110400.