Description:
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Calling Imagick::getColorspace() always returns imagick::COLORSPACE_UNDEFINED (0), no matter what is an input image. Trying to call CLI tool "identify" always returns correct color space.

This is observed on actual Debian 11: 
php  Version: 2:7.4+76
imagemagick Version: 8:6.9.11.60+dfsg-1.3
php-imagick Version: 3.4.4+php8.0+3.4.4-2+deb11u2

Test script:
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<?php

$image = new Imagick($argv[1]);
var_dump($image->getColorSpace());

?>

Expected result:
----------------
! imagick::COLORSPACE_UNDEFINED

Actual result:
--------------
imagick::COLORSPACE_UNDEFINED