Create a setup as shown in the picture. Then place redstone dust on the gold block. The redstone will start pulsing on and off.
EDIT: This also happens with the setup shown in the second pic.
EDIT 2: And it also happens if you place the second redstone on top of the observer.
Thank you for your report!
However, this issue is a Duplicate of MC-109829.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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