I found a workaround that worked for me. I created a separate Level Sequence for each parameter I wanted to control. Inside each sequence, I added the specific parameter (like an effector value), and then set keyframes at frame 0 and frame 1000 with the min and max values I wanted to control.
Then, in Blueprint, I control the playhead position of each sequence at runtime using a float value to represent the parameter value. It’s a bit tedious to set up, especially if you’re managing multiple parameters, but this was the only reliable method I found that worked for my setup.
hope it help