Memory leak detected by Valgrind

[Zachary Fields via Bug reports for the GNU Bourne Again SHell]

Configuration Information [Automatically generated, do not change]:Machine: 
x86_64OS: linux-gnuCompiler: gccCompilation CFLAGS: -g -O2 
-fdebug-prefix-map=/build/bash-SmNvvg/bash-5.0=. -fstack-protector-strong 
-Wformat -Werror=format-security -Wall -Wno-parentheses 
-Wno-format-securityuname output: Linux pop-os 5.11.0-7614-generic 
#15~1618626693~20.10~ecb25cd-Ubuntu SMP Thu Apr 22 16:00:45 UTC  x86_64 x86_64 
x86_64 GNU/LinuxMachine Type: x86_64-pc-linux-gnu
Bash Version: 5.0Patch Level: 17Release Status: release
Description:        Super simple script to reproduce the behavior:
        **`leak.sh`**
        ```bash        #! /bin/bash        echo "Am I leaking?"        Execute 
under valgrind...        ```
        ```none        $ valgrind ./leak.sh         ==1365336== Memcheck, a 
memory error detector        ==1365336== Copyright (C) 2002-2017, and GNU 
GPL'd, by Julian Seward et al.        ==1365336== Using Valgrind-3.16.1 and 
LibVEX; rerun with -h for copyright info        ==1365336== Command: ./leak.sh  
      ==1365336==         Am I leaking?        ==1365336==         ==1365336== 
HEAP SUMMARY:        ==1365336==     in use at exit: 50,076 bytes in 766 blocks 
       ==1365336==   total heap usage: 858 allocs, 92 frees, 59,487 bytes 
allocated        ==1365336==         ==1365336== LEAK SUMMARY:        
==1365336==    definitely lost: 12 bytes in 1 blocks        ==1365336==    
indirectly lost: 0 bytes in 0 blocks        ==1365336==      possibly lost: 0 
bytes in 0 blocks        ==1365336==    still reachable: 50,064 bytes in 765 
blocks        ==1365336==         suppressed: 0 bytes in 0 blocks        
==1365336== Rerun with --leak-check=full to see details of leaked memory        
==1365336==         ==1365336== For lists of detected and suppressed errors, 
rerun with: -s        ==1365336== ERROR SUMMARY: 0 errors from 0 contexts 
(suppressed: 0 from 0)        ```
        If you change the script to use the dash, the default shell (sh) for 
Pop!_OS (and I assume all Debian distros), then it will run without leaking.
        Repeat-By:
        echo "#! /bin/bash        echo 'Am I leaking?'" > leak.sh \        && 
chmod +x leak.sh \        && valgrind --leak-check=full ./leak.sh