If powering a piston with a button, and then giving it an extra signal from another button, the piston will stay extended.
See https://media.giphy.com/media/aCEfzlTa4j3F2KDqmI/giphy.gif
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Please attach the animated picture correctly to the attachments rather than putting them in the "Environment" box. The "Environment" box is only for inputing your operating system, Java version, etc.

There does not appear to be any bug here. The piston is quasi powered while it is extended. When the quasi power stops, the piston does not retract because it does not receive an update. All intended behaviors.
I confirm it because on my solo world all the pistons are to remain active I was forced to change them of place