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The other factor is like when moving fish from one environment to another, plants can be stressed with the change. That can be the case with terrestrial plants as well as they try to adjust to new lighting and temperatures. One thing I had learned over the years is that aquatic plants really do need good quality lighting.

I have also seen some setups where the aquatic plant was actually "potted" and then buried in the gravel. You see this with pond plants where they might have the rootball in a basket-like pot that has slits and/or holes to allow roots to grow through but keeps the plant stable when buried in the aquarium substrate.

Hope you have better luck!!!