Python toolbox - tool connection is broken when open ArcGIS Pro

Question

Hi,

I created a Python toolbox with multiple tools and connect it to my project. When I save my project and open it again, the toolbox is shown in the catalog but when I click on it to see the tools , I am getting the broken connect symbol. I still can select edit and see my script but I can not use the tool because the connect is broken. If I right-click on the tool to see the properties, the connection is back. Any idea why this is happening?  
I am using ARcGIS pro 2.8. This bug is new. I used this toolbox a month ago with no problem.

thank for any inputs

Rakefet · Answer

the curse of cut and paste from an old script...

danretired · Answer

I guess showing the code would have been useful too 😉

Rakefet · Answer

Thanks. I added the tool to the project and it still did not work. What did the trick was deleting the line code:  map = aprx.activeMap