It does not. I have a unifi controller running on this platform as well. It might have that port taken already and the new web server failed to get setup.
when i tried http://pihole IP:8080, it was redirected to the unifi controller.
It appears that port 8080 is occupied by java, not pihole-FTL. From your debug log:
*** [ DIAGNOSING ]: Ports in use
udp:127.0.0.1:5335 is in use by unbound
udp:0.0.0.0:5353 is in use by avahi-daemon
udp:0.0.0.0:44278 is in use by avahi-daemon
[✓] udp:0.0.0.0:53 is in use by pihole-FTL
udp:0.0.0.0:68 is in use by dhcpcd
udp:0.0.0.0:514 is in use by rsyslogd
udp:0.0.0.0:514 is in use by rsyslogd
udp:0.0.0.0:51822 is in use by <unknown>
udp:0.0.0.0:631 is in use by cups-browsed
udp:0.0.0.0:41641 is in use by tailscaled
udp:*:5353 is in use by avahi-daemon
udp:*:3478 is in use by java
udp:[::ffff:100.91.4.141]:44558 is in use by java
udp:[::ffff:10.6.0.1]:46673 is in use by java
udp:*:10001 is in use by java
[✓] udp:*:53 is in use by pihole-FTL
udp:[::ffff:192.168.1.41]:53605 is in use by java
udp:*:514 is in use by rsyslogd
udp:*:514 is in use by rsyslogd
udp:*:51822 is in use by <unknown>
udp:*:41641 is in use by tailscaled
udp:*:37989 is in use by avahi-daemon
tcp:127.0.0.1:8953 is in use by unbound
tcp:127.0.0.1:631 is in use by cupsd
tcp:127.0.0.1:27117 is in use by mongod
tcp:100.91.4.141:41690 is in use by tailscaled
tcp:0.0.0.0:514 is in use by rsyslogd
[✓] tcp:0.0.0.0:53 is in use by pihole-FTL
tcp:127.0.0.1:5335 is in use by unbound
tcp:0.0.0.0:22 is in use by sshd
tcp:[fd7a:115c:a1e0:ab12:4843:cd96:625b:48d]:41690 is in use by tailscaled
tcp:*:8080 is in use by java
tcp:[::1]:631 is in use by cupsd
tcp:[::]:514 is in use by rsyslogd
tcp:*:8880 is in use by java
tcp:*:8843 is in use by java
tcp:*:6789 is in use by java
[✓] tcp:[::]:53 is in use by pihole-FTL
tcp:[::]:22 is in use by sshd
tcp:*:8443 is in use by java
Here is how it looks on my dev 6.0 that is working normally:
*** [ DIAGNOSING ]: Ports in use
udp:127.0.0.1:5335 is in use by unbound
udp:0.0.0.0:5353 is in use by avahi-daemon
udp:0.0.0.0:36853 is in use by avahi-daemon
[✓] udp:0.0.0.0:53 is in use by pihole-FTL
udp:0.0.0.0:68 is in use by dhcpcd
udp:*:5353 is in use by avahi-daemon
[✓] udp:*:53 is in use by pihole-FTL
udp:*:37277 is in use by avahi-daemon
tcp:0.0.0.0:8080 is in use by pihole-FTL
tcp:127.0.0.1:8953 is in use by unbound
tcp:127.0.0.1:5335 is in use by unbound
tcp:0.0.0.0:443 is in use by pihole-FTL
tcp:0.0.0.0:22 is in use by sshd
[✓] tcp:0.0.0.0:53 is in use by pihole-FTL
tcp:[::]:8080 is in use by pihole-FTL
tcp:[::]:443 is in use by pihole-FTL
tcp:[::]:22 is in use by sshd
[✓] tcp:[::]:53 is in use by pihole-FTL