3.0 to 3.2 sync error

Hello,

In testing 3.0 (latest) to 3.2 (latest) migration, sync always fails  
here on all mailboxes:


29392: write(6,"S2 SYNCAPPLY MAILBOX %(UNIQUEID  
6uxzsiuvofrhrf69dfs1uqxq MBOXNAME user.ppgw SYNC_CRC 2538953411  
SYNC_CRC_ANNOT 307862686 LAST_UI"...,4096) = 4096 (0x1000)
29392: write(6,"ATIONS (%(ENTRY /vendor/cmu/cyrus-imapd/thrid USERID  
NIL VALUE 87f494ec1d410ff7))) %(UID 18 MODSEQ 194 LAST_UPDATED  
1620897300 F"...,4096) = 4096 (0x1000)
29392: write(6,"12 LAST_UPDATED 1620897300 FLAGS () INTERNALDATE  
1608458977 SIZE 58108 GUID 03fd1fb95a2083a702fcf679a0e62182698ea1f8  
ANNOTATIONS"...,1984) = 1984 (0x7c0)
29392: sigprocmask(SIG_BLOCK,{ SIGINT|SIGQUIT|SIGALRM|SIGTERM|SIGCHLD  
},{ }) = 0 (0x0)
29392:  
pselect(0x7,0x7fffffffe390,0x0,0x0,0x7fffffffe2d0,0x7fffffffe2e0) = 1  
(0x1)
29392: sigprocmask(SIG_SETMASK,{ },0x0)          = 0 (0x0)
29392: read(6,"S2 NO IMAP_PROTOCOL_ERROR Protocol error\r\n",4096) = 42 (0x2a)
29392: getpid()                                  = 29392 (0x72d0)
29392: sendto(7,"<179>Aug 29 12:17:47 sync_client[29392]: MAILBOX  
received NO response: IMAP_PROTOCOL_ERROR Protocol  
error",105,0,NULL,0) = 105 (0x69)
29392: getpid()                                  = 29392 (0x72d0)
29392: sendto(7,"<179>Aug 29 12:17:47 sync_client[29392]:  
do_folders(): update failed: user.ppgw 'Bad protocol'",94,0,NULL,0) =  
94 (0x5e)
Error from sync_do_mailboxes(): bailing out!

So it is a IMAP_PROTOCOL_ERROR, but how do I find out which protocol  
is failing? And more importantly, how do I get rid of the error?

Thank you in advance,
Per


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