The leaf in the photo looks rather dessicated... if it is an old leaf, it is just "on the way out"... probably does not have good roots, if any. If you potted with no new roots showing, that might have set the plant back a bit. If it is now putting out new roots, there is no problem, the new growth will be nice and firm with those new roots to nourish and hydrate it.
In general, and especially with Catts, it is important to wait to repot until new roots start unless it is in really bad medium and might rot before it gets a chance to root (in which a small setback is better than losing the plant)
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