AnimationPlayer dictionary for AnimationLibraries does not accept values after the first

[LastPhoen1x]

Tested versions

Reproducible: 4.3 stable mono
Working: 4.1.1 stable mono

System information

Godot 4.3 mono - Windows 7

Issue description

When the dictionary that holds AnimationLibraries on the AnimationPlayer has 1 entry, trying to to add a key or value with the type of String or Object (possibly others, but float works) will make the focus shift as soon as you start typing the sting, and the Key-Value form resets.

Steps to reproduce

Open AnimationPlayer.
In Libraries dictionary select New Key's type "String".
Start typing the sting.
(alternatively, select Object and drag AnimationLibrary onto the input space)

Minimal reproduction project (MRP)

dictionary does not accept string.zip

[matheusmdx]

Bisecting points to #88231 as the culprit, @ajreckof