--delete2duplicates doesn't work for Exchange 2019

Hello,
Imapsync creates duplicate items on each run on host2.
using --delete2duplicates doesn't work. throws following error in debug mode;

host2 is exchange server 2019 cu11 with latest security update.
has anyone come accross this issue?
Regards,

++++ Verifying [INBOX] -> [INBOX]
Host2: msg INBOX/8643 marked \Deleted [duplicate] on host2
Sending: 11506 UID STORE 8643 +FLAGS.SILENT (\Deleted)
Sent 47 bytes
Read: 11506 BAD Command Argument Error. 11
ERROR: 11506 BAD Command Argument Error. 11 at /usr/local/share/perl5/Mail/IMAPClient.pm line 1388.
Mail::IMAPClient::ANON("11506 BAD Command Argument Error. 11\x{d}\x{a}") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 1424
Mail::IMAPClient::_get_response(Mail::IMAPClient=HASH(0x559a6d9d1878), 11506, undef) called at /usr/local/share/perl5/Mail/IMAPClient.pm line 1350
Mail::IMAPClient::_imap_command_do(Mail::IMAPClient=HASH(0x559a6d9d1878), "UID STORE 8643 +FLAGS.SILENT (\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 1248
Mail::IMAPClient::_imap_command(Mail::IMAPClient=HASH(0x559a6d9d1878), "UID STORE 8643 +FLAGS.SILENT (\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 1460
Mail::IMAPClient::_imap_uid_command(Mail::IMAPClient=HASH(0x559a6d9d1878), "STORE", 8643, "+FLAGS.SILENT", "(\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 2348
Mail::IMAPClient::store(Mail::IMAPClient=HASH(0x559a6d9d1878), 8643, "+FLAGS.SILENT", "(\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 2813
Mail::IMAPClient::delete_message(Mail::IMAPClient=HASH(0x559a6d9d1878), 8643) called at ./imapsync line 2701
main::single_sync(HASH(0x559a6e913408), HASH(0x559a6c7de220), HASH(0x559a6e905190)) called at ./imapsync line 1350
ERROR: 11506 BAD Command Argument Error. 11 at /usr/local/share/perl5/Mail/IMAPClient.pm line 1298.
Mail::IMAPClient::_imap_command(Mail::IMAPClient=HASH(0x559a6d9d1878), "UID STORE 8643 +FLAGS.SILENT (\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 1460
Mail::IMAPClient::_imap_uid_command(Mail::IMAPClient=HASH(0x559a6d9d1878), "STORE", 8643, "+FLAGS.SILENT", "(\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 2348
Mail::IMAPClient::store(Mail::IMAPClient=HASH(0x559a6d9d1878), 8643, "+FLAGS.SILENT", "(\Deleted)") called at /usr/local/share/perl5/Mail/IMAPClient.pm line 2813
Mail::IMAPClient::delete_message(Mail::IMAPClient=HASH(0x559a6d9d1878), 8643) called at ./imapsync line 2701
main::single_sync(HASH(0x559a6e913408), HASH(0x559a6c7de220), HASH(0x559a6e905190)) called at ./imapsync line 1350
Host2: msg INBOX/8644 marked \Deleted [duplicate] on host2
Sending: 11507 UID STORE 8644 +FLAGS.SILENT (\Deleted)
Sent 47 bytes