If you create an animation on a text color & opacity, you set a key at zero for the default value (by using the + on the text property) then you place the time cursor at 1 second, set the alpha to 0 and add the key by the “+” icon.
Select the keys of the RGB Color that are set at 1 second, drag them onto the timer and you will see that their value are reset to 0.
Whereas I was expecting them to move on the timeline.
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I was able to reproduce this issue on our end. I have written up a report ( UE-18432) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.