When you put the random tickspeed at really high numbers, all entities completely freeze and block updates don't work.
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duplicates 1
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RobinDinVienna
wobst.michael
Don't use insanely high numbers.
SPGoding
Resolving as a duplicate of MC-76117.
Well, yes, if you overload the game with having to do millions of instructions every millisecond, of course it freezes. That will not be fixable just don't set the tickspeed above eg 1000.