Flickering when using the outlinePass

I’ve been using the OutlinePass within a project I’m working on but recently upgraded to ThreeJS version 0.135 from 0.133 for several bugs that were fixed that way.

But now I have a recurring problem on some computers when adding an object to the OutlinePass.
It’s a pretty large project so uploading it with all the code might be difficult but right now I’m adding the outlinepass like in the examples, this worked perfectly before. I’ve removed all options so it is as bareboned as it could be.
So I was wondering if something has changes that could merit this behaviour.
ooutlinepass (2)

Downgraded to 0.133 again, working around some elements. Same code does not cause the flicker in this version. Will keep an eye on it and try to figure out what exactly happens here.