"So it's only Hotspot Interaction ActionLists that are being affected? Not other scene-based ActionLists e.g. Cutscenes, Triggers"?
Yes. And not all interactions in scene. About 10% of them.
Are you making use of any custom Actions"
Y…
"Is this the same situation, or were multiple scenes affected without any compilation issues"?
Multiple scenes (3). There is no compilation issues.
Interesting, that allways reset the same interactions in scene. But in Unity 2019 and 2021 …
Thanks, @ChrisIceBox. I found the following solution. May be, I don't understand something, but it works.
IEnumerator TurnPage(float time)
{
yield return new WaitForSeconds(time);
Menu menu = KickStarter.playerMenus.…