[knot-dns-users] Manual Key Rollover - 2 ZSKs with same key id

Hi, I performed a manual key roll over with this command: $ knotc zone-key-rollover dnssec-test.xxx zsk The result is 2 different ZSK's with the same key id: dnssec-test.xxx. 3600 IN DNSKEY 256 3 8 ( AwEAAc5W..... ) ; ZSK; alg = RSASHA256; key id = 7030 dnssec-test.xxx. 3600 IN DNSKEY 256 3 8 ( AwEAAc7Q5U...... ) ; ZSK; alg = RSASHA256; key id = 7030 2020-07-03T14:52:59 info: [dnssec-test.xxx.] DNSSEC, key, tag 56464, algorithm RSASHA256, KSK, public, ready, active+ 2020-07-03T14:52:59 info: [dnssec-test.xxx.] DNSSEC, key, tag 7030, algorithm RSASHA256, public 2020-07-03T14:52:59 info: [dnssec-test.xxx.] DNSSEC, key, tag 7030, algorithm RSASHA256, public, active 2020-07-03T14:52:59 info: [dnssec-test.xxx.] DNSSEC, signing started 2020-07-03T14:52:59 info: [dnssec-test.xxx.] DNSSEC, zone is up-to-date Is it the indented behavior to have two ZSK's with the same key id? Thanks a lot, Thomas