I've discovered that if you spawn a lot of sulfur cubes in a box and give them blocks that there can be one sticking to the ceiling. If you then remove the others, it sticks to the ceiling.
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Thank you for your report!
However, this issue has actually already been reported in MCPE-237914, so I'll be resolving this one as a Duplicate.
This one has been in the game since the first preview with sulfur cubes, it's quite silly. I will attach your screenshot to that report, as it doesn't contain one. If you have any additional information you'd like to add, head over to the linked report and leave a comment!
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