If you are crouching under a slab and try to place another in front of the slab that keeps you crouched, you will not be able to do it, the slab will not be laid.
MCPE-166644
Being crouched under a slab, you can not place said block in front of the slab that keeps you crouched
Resolved
Duplicate
0
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We're tracking this issue in MCPE-155016, so this ticket is being resolved and linked as a duplicate.
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