I tested the package on a generic 5.15 kernel and I realized it won't build at all because the exclusive kernel rule won't match 5.15 anymore because of the extra space added.
A new fix is required to solve this.

I attached a new debdiff with the proper fix.

Tested on a VM with 5.15.0-57-generic: It should build 
ubuntu@jammy:~/rtl$ sudo dpkg -i rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb 
(Reading database ... 81589 files and directories currently installed.)
Preparing to unpack rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb ...
Module rtl8821ce-5.5.2.1 for kernel 5.15.0-57-generic (x86_64).
Before uninstall, this module version was ACTIVE on this kernel.

rtl8821ce.ko:
 - Uninstallation
   - Deleting from: /lib/modules/5.15.0-57-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

/etc/modprobe.d/dkms.conf: removed 'blacklist rtw88_8821ce'
depmod...
Deleting module rtl8821ce-5.5.2.1 completely from the DKMS tree.
Unpacking rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) over (5.5.2.1-0ubuntu11~0.22.04.3) ...
Setting up rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) ...
Loading new rtl8821ce-5.5.2.1 DKMS files...
Building for 5.15.0-57-generic
Building initial module for 5.15.0-57-generic
EFI variables are not supported on this system
/sys/firmware/efi/efivars not found, aborting.
Done.

rtl8821ce.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.15.0-57-generic/updates/dkms/

/etc/modprobe.d/dkms.conf: added 'blacklist rtw88_8821ce'
depmod...


Also tested on a VM with linux-kvm. I should not build because modules is not there
ubuntu@jammy:~$ sudo dpkg -i rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb 
(Reading database ... 223166 files and directories currently installed.)
Preparing to unpack rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb ...
Deleting module rtl8821ce-5.5.2.1 completely from the DKMS tree.
Unpacking rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) over (5.5.2.1-0ubuntu11~0.22.04.2) ...
Setting up rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) ...
Loading new rtl8821ce-5.5.2.1 DKMS files...
Building for 5.15.0-1033-kvm 
Building initial module for 5.15.0-1033-kvm
Error! The /var/lib/dkms/rtl8821ce/5.5.2.1/5.15.0-1033-kvm/x86_64/dkms.conf for module rtl8821ce includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
The /var/lib/dkms/rtl8821ce/5.5.2.1/5.15.0-1033-kvm/x86_64/dkms.conf for module rtl8821ce includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
This indicates that it should not be built.
Skipped.

and on jammy:5.19. It should not build because it's a 5.19 not 5.15 kernel:

ubuntu@jammy:~$ sudo dpkg -i rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb
Selecting previously unselected package rtl8821ce-dkms.
(Reading database ... 99576 files and directories currently installed.)
Preparing to unpack rtl8821ce-dkms_5.5.2.1-0ubuntu11~0.22.04.3_all.deb ...
Unpacking rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) ...
Setting up rtl8821ce-dkms (5.5.2.1-0ubuntu11~0.22.04.3) ...
Loading new rtl8821ce-5.5.2.1 DKMS files...
Building for 5.19.0-1025-aws
Building initial module for 5.19.0-1025-aws
Error! The /var/lib/dkms/rtl8821ce/5.5.2.1/5.19.0-1025-aws/x86_64/dkms.conf for module rtl8821ce includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
This indicates that it should not be built.
Skipped.