This applies to every and any brush I use, trails with breaks in the lines. Unfortunately, I can’t recall what version I initially had, though to note: I use an array of plugins which could be part of the issue.
Here’s an example with low opacity brushes:-
The jagged, broken lines appear regardless of speed drawn. Only other difference I’ve noticed is one of the plugins I use, Brush SFX ( Brush Sound Effects ) isn’t working since the update and in attempt of deactivating it, I cannot. 
Hi, BrushSfx dev here.
What is the error message given by BrushSfx? You can see it if you hover your cursor over the BrushSfx on the plugin list. Also are you using the latest BrushSfx version? You can check the version looking at the border of the BrushSfx configuration window, it should be 1.1.9, if it doesnt show any version then it is surely outdated.
Talking the plugin, did you update to Krita 6, which is Qt6? If the plugin is written for Krita 5, which is Qt 5, Krita 6 will disable the plugin.
I have double checked and It was frankly a mistake on my own end, having tried implementing the 1.1.9 version of the plugin suited for Russian translation - that was a fault on my end.
So yes, going via GitHub did solve the issue; both the brushes and plugin now promptly function. Thank you for your help, means a bunch!
