I believe the word was already in use to denote a malfunction of any sort of machine or device. As such this was a bug (insect) that caused a bug (glitch); it was punny already in 1947.

neat part of history, but i dont think that's what that says.

the last sentence starts with "Originating with Thomas Edison in the 1800s, the term “bug” is still used [...]", and there would be no reason to use the word "actual" in the sentence "First _actual_ case of bug being found" if it was the origin of the term.

my clanker found this: https://spectrum.ieee.org/did-you-know-edison-coined-the-ter...

"The use of “bug” to describe a flaw in the design or operation of a technical system dates back to Thomas Edison. He coined the phrase 140 years ago to describe technical problems during the process of innovation."

the moth seems to be a popular misconception, though, given that the article starts with "Ask someone to identify the first computer bug, and he or she might mention computer programmer Grace Hopper and the dead moth found in a relay of Harvard University’s Mark II electromechanical computer in 1947"