As noted in the other thread, Galley view is designed not to perform the same kind of collision avoidance that Page view does. This helps make Galley view more lightweight and responsive.
This is expected – when you delete the lyrics, Dorico doesn’t need to allocate space for them anymore.
What kinds of collisions are you seeing with lyrics? If they’re horizontal, can you use a smaller font for your purposes? If they’re vertical (colliding with notes above them), can you increase the values at Engraving Settings > Lyrics > Vertical Position?
Can you explain a little about what kinds of changes you make that get overridden by Dorico?