The bug
In certain configurations, observers are detecting updates to redstone that is placed on top of them. Video demonstrating the issue.
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Can confirm, it is like that also in 18w09a, any connecting redstone away from those observers will trigger a pulse as well.
LuxiKeks
Affects 1.13-pre1
NeunEinser
Can confirm for 1.13-pre2
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I've bee testing this today in 1.13-pre2 and have experienced a crash "Exception while ticking". Trying to recreate and not sure if it is related to bug or not.
NeunEinser
Can confirm for 1.13-pre3.
For me, it does not crash in 1.13-pre2 or pre3. You might want to make a seperate report for the crash.
michael