I like using their dockers but sometimes I have to revert to the official dockers to get better updates & functions, in our case LDAP was broken in all nextcloud dockers listed in the app store.
what else do you have connected to your LDAP <--- off topic.
I got airsonic advanced, matrix server, email server, nextcloud, & strangely pfsense for guest wifi via captive portal, so users can authenticate with their LDAP