Length gotten from references to an value of an array is always 0

Dear GNU Team,
I'm using the name reference to get the length of an object from an array,
but it outputs `0`.
Here's an example:
```
$ b=(1 2 3)
$ echo "${#b[2]}"
1
$ declare -ng c=b[2]
$ echo $c
3
$ echo ${#c} # Expected result: 1
0
$ declare -ng c=b
$ echo ${#c} # This works
1
$ # I need to use this and it's O(n):
$ d=$c
$ echo "${#d}"
1
$ echo $BASH_VERSION
5.2.21(1)-release
$ uname -a
Linux SECRET 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu
Jun  5 18:30:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
```