Description:
------------
running the line

$fn = '/var/www/vhosts/.........../myfile.png';
$im = new imagick($fn); // where myfile.png exists and can be viewed if run directly from the browser

but I get the following error:

Uncaught ImagickException: unable to open file `/tmp/magick-5465d-r7LT2tZ8Ip': No such file or directory @ error/constitute.c/ReadImage/604 in ....

When I run the same code on a different server, it works!
When I run against another test file it works ok. 

If it is something about myfile.png that is causing this problem then improved error messages should be given

Test script:
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<?php
    
$fn = 'https://www.methodfish.com/images/crop2493_1.png';

$im = new Imagick();
$im->readImage($fn);  // <------ it blows up here (line 6)

// Display the image
header("Content-Type: image/png");
echo $im->getImageBlob();

Expected result:
----------------
I would hope to see the https://www.methodfish.com/images/crop2493_1.png image on the screen

Actual result:
--------------
Fatal error: Uncaught ImagickException: unable to open file `/var/www/vhosts/......./tmp/magick-19229B77I2QMCe1Z2': No such file or directory @ error/constitute.c/ReadImage/604 in 
/var/www/vhosts/..../test.php:6

Stack trace: 
#0 /var/www/vhosts/......./test.php(6): Imagick->readimage('https://www.met...') 
#1 {main} thrown in /var/www/vhosts/...../test.php on line 6