In creative mode, I don't know if this is intentional, but tipped arrows are consumed when fired. Unlike just firing a normal bow in creative and having infinite arrows, tipped arrows are consumed.
MC-97887
Tipped Arrows in Creative bug
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Yeah, I noticed this one myself. And so did Xisuma (a guy from YouTube).
I think Mojang overwrote the default code for tipped arrows so it would always consume the arrow, but didn't take into account that it might affect Creative as well.
Edit: Additionally, you can GENERATE tipped arrows by left/right clicking them.