Many users have already reported these errors. Actions with tween (any kind) randomly stop working correctly. What used to work well suddenly stops working. I know tween actions have been changed from ms to seconds. The problem seems to be that both expressions do not coexist correctly, but there is no automatic modification of the code to convert everything to the new expression. The striking thing is that I run a preview and it works normally. Then I do another one and maybe an action with tween (random) stops working correctly. If I exit Gdevelop without saving the changes and enter again, that error is no longer there (momentarily). This makes it impossible for me to make progress in the game and save them. Can this be solved in any new update? Redoing all the actions mentioned is not feasible.
Is it possible for you to create a project where these issues happen consistently and send it over so that we can have a look?
I will try but I don’t have much time in the day and it is not easy. I need to create a project in previous versions of Gdevelop and then install the new one and wait for it to happen.