See valgrind log attached & below.

==1387732== Memcheck, a memory error detector
==1387732== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==1387732== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==1387732== Command: /usr/bin/phpunit --exclude-group network --no-coverage
==1387732== 
PHPUnit 11.5.8 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.4.4
Configuration: /mnt/packages/git_repos/dpkg/php-league-csv/phpunit.xml

...............................................................  63 / 678 (  
9%)
............................................................... 126 / 678 ( 
18%)
..........DDDDD................................................ 189 / 678 ( 
27%)
....................................DDDDDDDDDDD.............zend_mm_heap 
corrupted
==1387732== 
==1387732== Process terminating with default action of signal 6 (SIGABRT)
==1387732==    at 0x537DDCC: __pthread_kill_implementation (pthread_kill.c:44)
==1387732==    by 0x5329D01: raise (raise.c:26)
==1387732==    by 0x53124EF: abort (abort.c:79)
==1387732==    by 0x21E1BC: zend_mm_panic.constprop.0 (zend_alloc.c:398)
==1387732==    by 0x21E3FB: zend_mm_get_next_free_slot (zend_alloc.c:1326)
==1387732==    by 0x21E3FB: zend_mm_alloc_small (zend_alloc.c:1410)
==1387732==    by 0x21E3FB: zend_mm_alloc_heap (zend_alloc.c:1488)
==1387732==    by 0x21E3FB: _emalloc.cold (zend_alloc.c:2740)
==1387732==    by 0x502EDA: zend_string_alloc (zend_string.h:176)
==1387732==    by 0x502EDA: zend_string_init (zend_string.h:198)
==1387732==    by 0x502EDA: lex_scan (zend_language_scanner.c:2038)
==1387732==    by 0x45858B: zendlex (zend_compile.c:2040)
==1387732==    by 0x4F8A1E: zendparse (zend_language_parser.c:5011)
==1387732==    by 0x4FBE51: zend_compile (zend_language_scanner.c:601)
==1387732==    by 0x4FD5C6: compile_file (zend_language_scanner.c:655)
==1387732==    by 0xA04E557: phar_compile_file (phar.c:3312)
==1387732==    by 0x8016EAD: xdebug_compile_file (base.c:94)
==1387732== 
==1387732== HEAP SUMMARY:
==1387732==     in use at exit: 5,382,219 bytes in 42,273 blocks
==1387732==   total heap usage: 1,026,852 allocs, 984,579 frees, 71,419,640 
bytes allocated
==1387732== 
==1387732== LEAK SUMMARY:
==1387732==    definitely lost: 33,792 bytes in 1,056 blocks
==1387732==    indirectly lost: 40 bytes in 1 blocks
==1387732==      possibly lost: 3,392,974 bytes in 23,194 blocks
==1387732==    still reachable: 1,955,413 bytes in 18,022 blocks
==1387732==         suppressed: 0 bytes in 0 blocks
==1387732== Rerun with --leak-check=full to see details of leaked memory
==1387732== 
==1387732== For lists of detected and suppressed errors, rerun with: -s
==1387732== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==1387732== Memcheck, a memory error detector
==1387732== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==1387732== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==1387732== Command: /usr/bin/phpunit --exclude-group network --no-coverage
==1387732== 
PHPUnit 11.5.8 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.4.4
Configuration: /mnt/packages/git_repos/dpkg/php-league-csv/phpunit.xml

...............................................................  63 / 678 (  9%)
............................................................... 126 / 678 ( 18%)
..........DDDDD................................................ 189 / 678 ( 27%)
....................................DDDDDDDDDDD.............zend_mm_heap corrupted
==1387732== 
==1387732== Process terminating with default action of signal 6 (SIGABRT)
==1387732==    at 0x537DDCC: __pthread_kill_implementation (pthread_kill.c:44)
==1387732==    by 0x5329D01: raise (raise.c:26)
==1387732==    by 0x53124EF: abort (abort.c:79)
==1387732==    by 0x21E1BC: zend_mm_panic.constprop.0 (zend_alloc.c:398)
==1387732==    by 0x21E3FB: zend_mm_get_next_free_slot (zend_alloc.c:1326)
==1387732==    by 0x21E3FB: zend_mm_alloc_small (zend_alloc.c:1410)
==1387732==    by 0x21E3FB: zend_mm_alloc_heap (zend_alloc.c:1488)
==1387732==    by 0x21E3FB: _emalloc.cold (zend_alloc.c:2740)
==1387732==    by 0x502EDA: zend_string_alloc (zend_string.h:176)
==1387732==    by 0x502EDA: zend_string_init (zend_string.h:198)
==1387732==    by 0x502EDA: lex_scan (zend_language_scanner.c:2038)
==1387732==    by 0x45858B: zendlex (zend_compile.c:2040)
==1387732==    by 0x4F8A1E: zendparse (zend_language_parser.c:5011)
==1387732==    by 0x4FBE51: zend_compile (zend_language_scanner.c:601)
==1387732==    by 0x4FD5C6: compile_file (zend_language_scanner.c:655)
==1387732==    by 0xA04E557: phar_compile_file (phar.c:3312)
==1387732==    by 0x8016EAD: xdebug_compile_file (base.c:94)
==1387732== 
==1387732== HEAP SUMMARY:
==1387732==     in use at exit: 5,382,219 bytes in 42,273 blocks
==1387732==   total heap usage: 1,026,852 allocs, 984,579 frees, 71,419,640 bytes allocated
==1387732== 
==1387732== LEAK SUMMARY:
==1387732==    definitely lost: 33,792 bytes in 1,056 blocks
==1387732==    indirectly lost: 40 bytes in 1 blocks
==1387732==      possibly lost: 3,392,974 bytes in 23,194 blocks
==1387732==    still reachable: 1,955,413 bytes in 18,022 blocks
==1387732==         suppressed: 0 bytes in 0 blocks
==1387732== Rerun with --leak-check=full to see details of leaked memory
==1387732== 
==1387732== For lists of detected and suppressed errors, rerun with: -s
==1387732== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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