It seems in alpha 92 of 2.55, once the hold up animation is over Link can move, along with enemies, even though messages freeze all action is on. It ignores the string on screen, but it can still go away when the button is pressed at the end. I am using the built in item string pickup.
Edit- this doesn't seem to happen with scripted item pickups (I'm using the database heart piece one).
Edited by Jared, 17 June 2021 - 07:31 PM.