Bugs and glitches
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Known bug, no current solution.
As long as there isn't abuse it shouldn't be a problem, and since it's ultimately just obsidian and glass it shouldn't be too big a deal. -
Very true, it's just a pain to have you inventory getting filled with it, it has no other use than to shield from the wither
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Yeah, unfortunately nothing we can fix.

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Dupe bug:
Black hole talisman with a block inside in an ender IO crafter will dupe the block one stack at a time. -
report it here, but since 2.3.5 is the final pack version it will never be fixed