Hi,
This is probably not a huge problem but found it kind of annoying, if you write a tooltip in a variable you must press enter to validate it otherwise it gets removed if you click inside your blueprint.
To reproduce:
1- Select a variable and write something in the tooltip
2- Left click inside your blueprint.
Note: If you select another variable or click inside a window the problem doesn’t happen, only if you click inside your blueprint.
Cheers.