StyleboxTexture not displaying

[markdibarry]

Tested versions

Godot v4.6.dev.mono (7716a4c)

System information

Linux Mint 22.2 (Zara) on X11 - X11 display driver, Single-window

Issue description

Stylebox texture no longer previews or displays.

Steps to reproduce

Add a stylebox texture to a PanelContainer.

Minimal reproduction project (MRP)

stylebox-bug.zip

[markdibarry]

Bisected the issue to 90c0e6a

[AThousandShips]

CC @stuartcarnie