Yeah experienced the same issue where my text would default to the top of the container vs holding it's set line height after publishing.
But prior publish everything looks good. In earlier version of the same composition, line height was held after publishing. So I am assuming a new issue.
Im in the midst of a project and seem to be constantly running into bugs, nested symbols seem to be particularly unstable, especially when imported
Can you share that composition with us to check out the issue?
I have since deleted the composition and started again, should this problem reoccur i will send you the files.