ScrollContainer not Working in OptionButton

[TheFirstInvoker]

Tested versions

Reproducible in 26.1-Beta
Not Reproducible in 4.4

System information

MX Linux 25 - Redot 26.1-Beta LinuxBSD x86_64 - Vulkan

Issue description

In 4.4 you can create a scrollable OptionButtons by adding a ScrollContainer child to its PopupMenu and defining a max_size value. In 26.1-Beta, this behaviour seems to be missing. These screenshots are from the same project on both versions:

4.4 26.1

Steps to reproduce

1-Create an OptionButton with a long list of items
2-Add the following code:
func _ready() -> void:
get_popup().max_size = Vector2i(200, 200)
get_popup().add_child(ScrollContainer.new())
3-Try it on both versions

Minimal reproduction project (MRP)

project.zip

Here's the MRP with all ready to be tested, thanks in advance

[Arctis-Fireblight]

Thanks for reporting!
I'll look into it.

[Arctis-Fireblight]

Can someone on the @Redot-Engine/bug-hunter team test this against Godot 4.5.1?