I have 2 server A, B.
Server A works properly, server B doesn’t.

On Server B, if I perform the command

php7.4 -d display_startup_errors=on -d display_errors=on

I get the following error:

Warning: PHP Startup: Unable to load dynamic library 'gd.so' (tried: /usr/lib/php/20190902/gd.so (libdav1d.so.4: cannot open shared object file: No such file or directory), /usr/lib/php/20190902/gd.so.so (/usr/lib/php/20190902/gd.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

On server A, everything is fine, when I perform the command above.

On server A, when I perform lsof /usr/lib/php/20190902/gd.so

I get the following output:

COMMAND      PID     USER  FD   TYPE DEVICE SIZE/OFF    NODE NAME
php-fpm7. 453528     root mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453529 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453530 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453531 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453532 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453533 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453534 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453535 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so
php-fpm7. 453536 www-data mem    REG    8,1   112744 1578754 ./php/20190902/gd.so

On server B, I dont get any output, when i perform the command above.

None of the 2 server actually have a file called libdav1d.so.4 but they both have a file called libdav1d.so.6

My question is:

1. How can I print all shared objects regarding php7.4
   (ldd php7.4 does not print gd.so, neither on server A nor server B)

2. From where does server B get the information to look for libdav1d.so.4? Can I change the entry somewhere?

3. From where can I get the trace of loaded shared objects regarding gd.so on server A?