BBCode [fade] tag doesn't fade properly when there's a newline before the tag

[Oliver-makes-code]

Tested versions

v4.3.stable.official

System information

Arch Linux, Kernel version 6.12.7-arch1-1, Mobile GTX1650, i5-11300H, Godot 4.3 stable

Issue description

When writing text with the [fade] tag, it renders weirdly if you have a newline before the tag, sometimes to the point of not fading at all

Steps to reproduce

Create a RichTextLabel, enable BBCode, write some text on two lines with a [fade] tag on the second

Minimal reproduction project (MRP)

Archive.zip

[Mickeon]

Could you provide a screenshot to quickly see what "rendering weird" means?