In the OC Web -> administration-> LDAP Configuration page the LDAP Connection password once inserted to test the LDAP connectivity and to test an user/password, the field is cleared.
This is a new behavior in Spectrum 21.2.8 respect the previous Spectrum versions.
Release : 21.2.8
From the engineering this is a FAD.
You need to retype the password every time you perform the action as the passwords are getting cleared.