The bug tracker link posted back in May - where the user said that the target fix was 5.1 - has been updated recently with a new target fix of 5.4.
So we expect this to be an issue for some time, Epic clearly don’t think it’s important.
Unfortunately the above fixes aren’t working for me in 5.1, luckily (I guess) this only affects one part of my HUD which I’ve had to just disable for now. Extremely frustrating and I’m regretting updating our project to 5.x now.