Unexpected behaviour with transparent sprites

2D
,
1

Hi all. I have these image of two lines which looks like this: (1st image is variant I import in Unity, and 2nd one is for me just to check how its gonna look on the black background.

9370997--1310648--upload_2023-9-27_18-18-7.png
9370997--1310648--upload_2023-9-27_18-18-7.png1073×632 216 KB
9370997--1310651--upload_2023-9-27_18-18-23.png
9370997--1310651--upload_2023-9-27_18-18-23.png1058×617 147 KB

However, in Unity transparent image looks like this on the default black background. Any ideas why?
9370997--1310654--upload_2023-9-27_18-21-18.png
9370997--1310654--upload_2023-9-27_18-21-18.png1159×660 219 KB

2

There’s various compression setting when you import a texture, maybe related to those.

3

I just found out that this problem appears only in new Unity projects. Doing exactly the same things works as expected in older projects, though settings of projects are the same.