Regression in 5.2 in arithmetic comparison

[Glenn Jackman]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2
uname output: Linux exercism-vm 5.15.0-50-generic #56-Ubuntu SMP Tue Sep 20
13:23:26 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.2
Patch Level: 0
Release Status: release

Description:
        an arithmetic comparison where an array index contains an array
element fails.

Repeat-By:
        in bash 5.2
                $ coins[3]=10 i=3 C[5]=42 p=15
                $ # comparison throws error
                $ (( C[p - coins[i]] > 10)) && echo Y || echo N
                bash: p - coins\[i\]: syntax error: invalid arithmetic
operator (error token is "\[i\]")
                $ # but arithmetic expression is OK
                $ echo $(( C[p - coins[i]] ))
                42

        compare to bash 5.1
                $ coins[3]=10 i=3 C[5]=42 p=15
                $ (( C[p - coins[i]] > 10)) && echo Y || echo N
                Y
                $ echo $(( C[p - coins[i]] ))
                42