OK, that looks better:
./mac.sh macos
Creating macos in /data/vm/macos/macos
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut… Fertig
Statusinformationen werden eingelesen… Fertig
dmg2img ist schon die neueste Version (1.6.7-1+b1).
libguestfs-tools ist schon die neueste Version (1:1.44.0-2).
make ist schon die neueste Version (4.3-4.1).
p7zip-full ist schon die neueste Version (16.02+dfsg-8).
qemu-block-extra ist schon die neueste Version (1:5.2+dfsg-11+deb11u2).
uml-utilities ist schon die neueste Version (20070815.4-1).
wget ist schon die neueste Version (1.21-1+deb11u1).
git ist schon die neueste Version (1:2.30.2-1+deb11u1).
0 aktualisiert, 0 neu installiert, 0 zu entfernen und 4 nicht aktualisiert.
Klone nach 'OSX-KVM' ...
remote: Enumerating objects: 659, done.
remote: Counting objects: 100% (659/659), done.
remote: Compressing objects: 100% (565/565), done.
remote: Total 659 (delta 66), reused 622 (delta 54), pack-reused 0
Empfange Objekte: 100% (659/659), 29.48 MiB | 6.00 MiB/s, fertig.
Löse Unterschiede auf: 100% (66/66), fertig.
Submodul 'resources/OcBinaryData' (https://github.com/acidanthera/OcBinaryData.git) für Pfad 'resources/OcBinaryData' in die Konfiguration eingetragen.
Klone nach '/data/vm/macos/macos/OSX-KVM/resources/OcBinaryData' ...
remote: Enumerating objects: 1164, done.
remote: Counting objects: 100% (372/372), done.
remote: Compressing objects: 100% (362/362), done.
remote: Total 1164 (delta 16), reused 12 (delta 10), pack-reused 792
Empfange Objekte: 100% (1164/1164), 67.70 MiB | 4.38 MiB/s, fertig.
Löse Unterschiede auf: 100% (142/142), fertig.
Submodul-Pfad: 'resources/OcBinaryData': '4d362e85befcd4493ae8d32c65c728f96eb13eeb' ausgecheckt
1. High Sierra (10.13)
2. Mojave (10.14)
3. Catalina (10.15)
4. Big Sur (11.7) - RECOMMENDED
5. Monterey (12.6)
6. Ventura (13)
Big Sur (11.7) - RECOMMENDED
Downloading 694-35959...
Saving http://oscdn.apple.com/content/downloads/41/28/071-71279/5djpevqmc2w0ti2c4n1m8mkz7fm791t1ic/RecoveryImage/BaseSystem.dmg to BaseSystem.dmg...
Note: The total download size is 637.20 MB
Download complete!
Saving http://oscdn.apple.com/content/downloads/41/28/071-71279/5djpevqmc2w0ti2c4n1m8mkz7fm791t1ic/RecoveryImage/BaseSystem.chunklist to BaseSystem.chunklist...
Note: The total download size is 2596 bytes
Download complete!
qemu: module block-block-dmg-bz2 not found, do you want to install qemu-block-extra package?
qemu: module block-block-dmg-lzfse not found, do you want to install qemu-block-extra package?
Formatting 'mac_hdd_ng.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=137438953472 lazy_refcounts=off refcount_bits=16
Domain 'macos' defined from macos.xml
Display More
What do think about these two messages:
qemu: module block-block-dmg-bz2 not found, do you want to install qemu-block-extra package?
qemu: module block-block-dmg-lzfse not found, do you want to install qemu-block-extra package?
qemu-block-extra is already the latest package:
apt install qemu-block-extra
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut… Fertig
Statusinformationen werden eingelesen… Fertig
qemu-block-extra ist schon die neueste Version (1:5.2+dfsg-11+deb11u2).
0 aktualisiert, 0 neu installiert, 0 zu entfernen und 4 nicht aktualisiert.
So I tried to start the new macos vm and saw the following red message block:
500 - Internal Server Error
Unable to - poweronKonnte Schnittstellen-MTU auf 'virbr0' nicht erhalten: Kein passendes Gerät gefunden
After removing the network interface and adding my own network bridge, I see the macos setup guide. 
You are my hero of the day! 
So, it installs big-sur. but I would like to install ventura.
1. High Sierra (10.13)
2. Mojave (10.14)
3. Catalina (10.15)
4. Big Sur (11.7) - RECOMMENDED
5. Monterey (12.6)
6. Ventura (13)
Big Sur (11.7) - RECOMMENDED
What do you think about ventura with kvm? Why is big-sur recommended?
EDIT: I changed the variable from svers="big-sur" to svers="ventura" and now try my luck. But I am still interested in your opinion for Ventura in KVM. 
EDIT 2: Ventura doesn't work:

Any idea?
EDIT 3: OK, my server doesn't support AVX2.0 natively. Maybe its solvable with this fix:
I am unsure...
Next try "monterey". Looks better:

OK, had to activate a macvtap network. Until now I only used omv network bridges with my vms. macOS doesn't recognize these omv bridges. macvtap to to omv bridge works.
Now, it needs two hours:

Thank you so much!
Hoppel