Phar Class decompressFiles() bad in PHP 7.4 and 8.x branches

Description

The following code:

...

<?php
$p = new Phar('/home/gearond/my.phar', FilesystemIterator::SKIP_DOTS | FilesystemIterator::UNIX_PATHS, 'my.phar');
$p['myfile.txt'] = 'four score and seven years ago our fathers.';
$p['myfile2.txt'] = 'four score and severn years ago our mothers.';
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump($p->getSupportedCompression() );
var_dump( $p->compressFiles(Phar::GZ) );
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump( $p->decompressFiles() );
foreach ($p as $file) {
    var_dump($file->getFileName());
    var_dump($file->isCompressed());
    var_dump($file->isCompressed(Phar::BZ2));
    var_dump($file->isCompressed(Phar::GZ));
}
var_dump( $p->extractTo("/home/gearond/Project/exploration", null, true) );
?>

Resulted in this output:

string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
array(1) {
  [0]=>
  string(2) "GZ"
}
NULL
string(10) "myfile.txt"
bool(true)
bool(false)
bool(true)
string(11) "myfile2.txt"
bool(true)
bool(false)
bool(true)
bool(true)
string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
bool(true)

gearond@gearond-XPS-15-9570:~/Project/exploration$ cat *.txt
K�/-R(N�/JUH�KQ(N-K-�S�LM,*VHL�WI��d��K�/-R(N�/JUH�KQ(N-K�S�LM,*VHL�Wɦ%�d��gearond@gearond-XPS-15-9570:~/Project/exploration$ 

But I expected this output instead:

string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
array(1) {
  [0]=>
  string(2) "GZ"
}
NULL
string(10) "myfile.txt"
bool(true)
bool(false)
bool(true)
string(11) "myfile2.txt"
bool(true)
bool(false)
bool(true)
bool(true)
string(10) "myfile.txt"
bool(false)
bool(false)
bool(false)
string(11) "myfile2.txt"
bool(false)
bool(false)
bool(false)
bool(true)
gearond@gearond-XPS-15-9570:~/Project/exploration$ cat *.txt
cat *.txt
four score and severn years ago our mothers.four score and seven years ago our fathers.gearond@gearond-XPS-15-9570:~/Project/exploration$


### PHP Version

php 8.1.2 and 7.4

### Operating System

ubuntu 20.04 and 22.04

Start with the provided Phar::compressFiles() and Phar::decompressFiles() reproduction on PHP 7.4 or 8.x, then trace the Phar implementation and its tests. Done means decompressFiles() leaves extracted files containing their original text rather than compressed bytes.