When I use the latest version of babylonjs 6.27.1, I sometimes encounter the error that “ActionManager.HasSpecificTriggers2 is not a function” when using new ActionManager and registerAction, but I did not encounter this error in my previous version 6.24.0.
Welcome to the community!
That’s an intriguing error - to my knowledge, nothing on ActionManager was changed between these two versions. 
Let’s try to get to the bottom of this 
First things first, are you able to reproduce this error on our Playground environment ( Babylon.js Playground (babylonjs.com)), or does it happen only in your project?
I’m sorry. I tried, but it’s not reproduced in our Playground environment. And in my own projects, this is an occasional mistake
No problem, knowing that it’s not reproducible in the PG is already a clue of itself When you say “occasional”, is it a frequent error or very rare? Also, how do the imports in your file look like?
This is so weird as I do not even understand how it is possible. Any thing you can share about it would be great ?
This is a frequent mistake in my projects, and occasionally it doesn’t come up.
Are these what you mean by imports
I find it strange, too, that this is no different from the way I wrote it before. I may not have found the real problem yet, but looking at the source code, I think that this error should not have happened
I made a visibilitychange monitor。Will stop scene render when the page is minimized。Something like this
I found that scene render stops when an error occurs and my scene is black. When I minimized it and cut it back, everything was fine
I missed an important piece of information, this mesh is generated by clone, whether this is different from the normal one
Wait you are cloning the mesh with an action manager ?
I think I have a repro with cloning https://playground.babylonjs.com/#J19GYK#576 let me see what I can do.
Oh ！ great! Thank you for your commitment to babylonjs！