What water are you using? Distilled?

The water I am using is collected rainwater, which is also used on all of my other CPs (as well as house plants).

When the area is experiencing drought and I've run out of stored rain water, I switch over to distilled water I buy from the store.

Was your ping was inside the infamous clear plastic cubes from Botanical Wonders, aka infamously as the "cubes of death"? If so, then its most likely died of shock from lowered humidity.

The pings inside these cubes are in very high humidity and low light levels; you take them out and they just go into shock. The growing media you use for your P. primuliflora is perfect, that's how I grow mine. The problem is getting them used to lower levels of humidity. You have to slowly adjust them to lower humidity by for keeping them inside the container but lifting a corner just enough to allow air circulation and don't put them under bright light just yet. Keep an eye if the ping start to look wilted, that way you can close the container to keep it from going into shock. If you see that your plant is doing fine, lift the corner a little bit more. The new leaves should by then be accustomed to the lower levels of humidity. This may take a while.

For some reason in my experience, P. primuliflora may take a while to adjust. I went through several until I was able to figure it was slow to adapt to lower levels of humidity that was killing them.

That certainly appears to be a Lowes cube of death purchase! P. primuliflora can be enigmatic. Open tray is good for them, right at a window sill. Watering from above is also fine, but wait until the water in the tray runs out. Distilled is a safe water, safer than rain or creek. I still use a combination of distilled and creekwater, as a backup.

@HK93 and petiolaris:

Yes, the ping came from a deathcube.

I believe I may have made a mistake by immediately removing the ping from the cube and placing it in the little pot I have for it.

As of right now, the ping is withered, but still has a few vivid green leaves at its center, and the withering seems to have stopped. The plant is just sitting there, probably in shock I guess. I'm thinking I'll just let nature take its course.

Next time (if there IS a next time with these particular CPs) I will be more attentive to the hardening process!

Thanks

As long as you have green from the crown, there is life. Wait it out.