Digicert TERENAPersonalCA3 doesn't use issuingDistributionPoint anymore. It's hard to survey CRLs that are actually in use, so I don't know if there are other important users, but the fact that nobody else reported such problems is an indication that it is not widely used among dirmngr users. Supporting this is a lot of work, because it makes validating certificates much more complicated, so this is unlikely to happen without strong motivation, so I am closing this here.