Logically, the creaking is a hostile mob, so it should follow the spawning rules as all the other hostile mobs. It spawned on base scaffolding, as in the center and had a solid block under it, or floating scaffolding as seen in the image.
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Also relates to MC-277337
Spawning on buttons and Redstone was deemed an intended feature, which is fine and can be fixed with slabs in a farm as intended, but just whether the scaffolding rule should apply here is up to a decision.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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Can confirm.