As mentioned in the summary, observers used to give two output signals when 2 of them were chained together and have been moved. It will only give one single impulse now when doing so.
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Probably caused by or the same issue as MC-151057.

It's unfortunately not. Even though your mentioned bug has been fixed, this observer bug is still there
MC-151418 seems to be the same issue.

Seems to be fixed in 1.14.2-pre1