So, I sometimes look up Sailor Moon genga (the original drawings by the animators) on various sites

So, I sometimes look up Sailor Moon genga (the original drawings by the animators) on various sites and I came across these.

It depicts Usagi talking to Chibiusa from the stairs, going back down them, then seemingly hearing something and looking back up. A few months later, I found a cel of an inbetween frame with Chibiusa turning to look at her.

I’m wondering if this is from episode 159 or something? Because after Chibiusa is done talking to Helios, we cut to Usagi and the girls at the cafe the next day. Usagi mentions in it that she asked Chibiusa if she was talking to someone last night and she replied that she was just talking to Momo on the phone, but she didn’t really believe it.

Was that scene animated but deleted afterwards? The corrections are clearly done by Ikuko Itoh (who was the animation director for 159), but none of her episodes show any scenes like this.

I can’t find the link to the genga’s auction page anymore, but here’s the page for the cel if anyone’s interested: https://page.auctions.yahoo.co.jp/jp/auction/o405430508