Godot 3.1.2: Black lines / borders around Sprite
[Edit: I already noticed I accidently put this into the discussions forum, it doesn't seem like I can delete/ remove it.
This question might work as a discussion too though, so I'll keep it here for now.]
In Godot 3.1.2 using OpenGL ES2, black borders/ lines seem to form around some sprites I have imported. Usually they appear on top of the sprite but can also "border" around it.
Being new to Godot development but coming from Unity I expect I did something wrong in the import or that the texture settings aren't set correctly. But so far I haven't been able to find any setting that resolves this issue.
So my question is: where can I find texture/image settings that can resolve this issue? Or if the issue stems from another source, how can I make sure that the images are being displayed without the black lines? (Bonus question: Is there also a way/ setting to display tiles in the Y-Axis non-blurry?)
(I'm pretty new to the Godot Forum so if my question is missing some details please let me know )