Inspector displays incorrect keys in exported dictionaries after deletion of entries

[SgtSmilies]

Tested versions

• Reproducible in: 4.3.rc3, 4.3.rc2
• Could not reproduce in: 4.0.3.stable, 4.1.2.stable, 4.2.1.stable

System information

Godot v4.3.rc3 - Windows 10.0.19045

Issue description

Exported dictionaries are displaying incorrect keys in the inspector in v4.3. Given a dictionary with multiple entries in the inspector, deleting an entry that is not the lowest entry will appear to delete the bottom-most key instead of the actually deleted key, while retaining the correct values. For example, with a dictionary that has entries {"A":1, "B":2, "C":3}, deleting entry "B":2 will now display {"A":1, "B":3}.

In addition, after deletion of some values, attempting to create entries that have different keys will conjure the spectre of the deleted entries, displaying the deleted keys instead of the ones you actually entered. Given the previous example, adding an entry of "D":4 will then display {"A":1, "B":3, "C":4}. I noticed another presumably related issue: deleting entries, tabbing away and back, and then undoing will display keys as duplicates of the bottom-most entry.

This appears to be exclusively a display error in the editor. If you highlight a different node and return, the values will display their appropriate values.

This issue appears to be a regression from 4.2.

Steps to reproduce

1. Open the MRP. Alternatively, export a dictionary and add arbitrary values to it (tested with int, string keys).
2. Open test.tscn in the editor. Look at the exported dictionary.
3. Delete any value from the dictionary other than the bottom-most one.
4. Add a new value to the dictionary other than the one that was just deleted.

Minimal reproduction project (MRP)

dictionary-issue.zip

[kleonc]

Not reproducible in v4.3.dev5.official [89f70e9].
Reproducible in v4.3.dev6.official [89850d5].

Likely regression from #88231. cc @ajreckof

[ajreckof]

Most likely a missing update of the label I'll take a look in the after noon should be easy to fix