aliases sometimes not expanded even with expand_aliases set

[ian]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -O2 -flto=auto -ffat-lto-objects -fexceptions -g 
-grecord-gcc-switches -pipe -Wall -Werror=format-security 
-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 
-mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection 
-fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
uname output: Linux sibyl.beware.dropbear.id.au 6.10.10-200.fc40.x86_64 #1 SMP 
PREEMPT_DYNAMIC Thu Sep 12 18:26:09 UTC 2024 x86_64 GNU/Linux
Machine Type: x86_64-redhat-linux-gnu

Bash Version: 5.2
Patch Level: 26
Release Status: release

Description:

        In the following script, the first alias fails with "comand not found" 
but the second works.

            #!/bin/bash

            shopt -s expand_aliases

            if :; then
                alias foo='echo'
                foo x y z
                shopt expand_aliases
                alias -p
            fi

            alias foo='echo'
            foo a b c

        Running it produces:

             $ ./alias-test.sh 
            ./alias-test.sh: line 7: foo: command not found
            expand_aliases      on
            alias foo='echo'
            a b c

        This is at least, undocumented behaviour.

Repeat-By:
        Run the script in "Description".