Extra Tips for Yellowing Leaf Neo?

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I didn't see how far south you are. Those temperatures are probably not the issue.

Some fungi leave distinctive patterns on leaves, or do characteristic things to plants, but others don't. If a plant truly has a fungal infection but you can't tell which one from the typical attack characteristics, you need to look at it under a microscope. Sometimes that isn't even enough.

If you regularly have very high humidity in your area, like routinely over 60-70% without daily excursions below this, you might have fungal issues. If the relative humidity is routinely below this it would be uncommon for a fungus to attack. When you see damaged leaves always look for a cultural issue first; fungus tends to attack plants when they are already sick, or when conditions are too hot, too cold or too humid.

I suspect from your description it's sunburn. Some plants are more susceptible than others. If so the leaves should just fall off. The fact that it's making new roots suggests it should go on to do well.