Merge view - jumping onChange

[natocTo]

Hello,

we are trying to implement merge view into our app and we came across this behaviour.

There is a simple sandbox: https://codesandbox.io/p/sandbox/competent-tom-8zpsy7

Please try to enter severals new lines (for example 50) into second editor (I just keep presed enter for while). When it hits certain point the view "jump" up over active cursor. And anytime you enter another char there (on some latest lines usually), it behave same (jump a little bit up). So it is really hard to write something there.

Did I miss some setting I have to use? Thank you very much for any help.