Multiple overlapping sprites with normal maps blended incorrectly

[szamq]

Godot version:
3.1 gles3

Issue description:
When you have overlapping sprites with normalmaps like in the gif and the project, the are incorrectly blended together. It looks like the normalmap from sprite below is going through the other one

Minimal reproduction project:
https://drive.google.com/open?id=19TOz7OEjTpsPJkOcpVv7IlfFy-Xi2ise

[KoBeWi]

Can anyone still reproduce this bug in Godot 3.2.2 or any later release?

(I tried the project, but not sure if this is still bugged)

[szamq]

Just tried on 3.2.2 and the bug is still there (normal map from sprite inside the viewport container is visible on the other sprite, even if you remove the normal map from the other sprite)