Phantom tab button steals input despite texture = `null`

[Wierdox]

Godot version

v4.0.2.stable.official [7a0977c] v4.2.dev6.official [57a6813]

System information

Windows 10

Issue description

When assigning an already valid tab button icon texture to null, it keeps a phantom tab button around that intercepts input from the tabs, even off the tab bar.

• Issue occurs in both TabContainer and TabBar.
• Assigning tab button icon from a texture to null will cause the issue.
• Will emit its tab_button_pressed signal, prevents tab beneath from getting the input.

Godot_v4.2-dev6_win64_AWBHLNAo4x.webm

Steps to reproduce

Download repro, run main and click around like the video above.

Minimal reproduction project

bug_reproduction.zip

[Wierdox]

I think I'm close to finding a simple fix, will open a PR probably later today.