[innocenat]

Are there any case where DNSSEC can be kept enabled? I though it need to be disabled for transferring.

[sybercecurity]

There is, but it requires cooperation between everyone and double signing between the old and new hosting service (for a short period of time). That rarely works out in the real world.

[teddyh]

There are some tools being worked on: https://github.com/DNSSEC-Provisioning/Multi-signer

[bauruine]

It shouldn't be a problem, at least i never had one, if you don't change the authoritative DNS servers.