That top gif is just extremely hard to see. Lots of extremely fast movement and flickering making it impossible to see what is happening.
Top gif from 4.3.5 is from working version. Watch from 4.3.8, you can see that tooltip is sometime freezing/stuck and tooltip position is changing from top to bottom and again top
Tooltip is showed only once, but next time is nothing visible.
This is also fixed in 4.3.8
Please check that and let us know if you have any problems left.
It can't be fixed. Gif I showed you in previous posts is from 4.3.8 version - where this bug is occuring, so this is the reason I'm asking.
You can reproduce it via test case I prepared in this topic.