Old Client Error - Please Help

Hi, I add a new string field in my model.
I activate develop mode, new field is added, but all old client have error.

String Field are optional on schema, I have not ever this error in past

This is log:

2022-08-26 11:10:42.226 Error: Connection[2]: Session[2]: Failed to integrate downloaded changesets: Failed to parse, or apply received changeset: Update: No such field: 'Token' in class 'class_Oratore' (instruction target: Oratore["cs-OR53"].Token, version: 18012, last_integrated_remote_version: 2, origin_file_ident: 3571, timestamp: 241431245890)
Exception backtrace:
0   librealm-wrappers.dylib             0x0000000111aa72f2 _ZN5realm4sync12_GLOBAL__N_125throw_bad_transaction_logENSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE + 34
1   librealm-wrappers.dylib             0x0000000111aa711c _ZNK5realm4sync18InstructionApplier19bad_transaction_logERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE + 1260
2   librealm-wrappers.dylib             0x0000000111aaccad _ZN5realm4sync18InstructionApplier12PathResolver8on_errorERKNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEE + 13
3   librealm-wrappers.dylib             0x0000000111aad1ca _ZN5realm4sync18InstructionApplier12PathResolver13resolve_fieldERNS_3ObjENS0_12InternStringE + 410
4   librealm-wrappers.dylib             0x0000000111aa930f _ZN5realm4sync18InstructionApplier12PathResolver7resolveEv + 111
5   librealm-wrappers.dylib             0x0000000111aa91f1 _ZN5realm4sync18InstructionApplierclERKNS0_5instr6UpdateE + 81
6   librealm-wrappers.dylib             0x0000000111ac7f67 _ZN5realm4sync13ClientHistory27integrate_server_changesetsERKNS0_12SyncProgressEPKyPKNS0_11Transformer15RemoteChangesetEmRNS0_11VersionInfoENS0_18DownloadBatchStateERNS_4util6LoggerENSE_14UniqueFunctionIFvRKNSt3__110shared_ptrINS_11TransactionEEEEEEPNS1_20SyncTransactReporterE + 1431
7   librealm-wrappers.dylib             0x0000000111ad92c5 _ZN5realm4sync10ClientImpl7Session20integrate_changesetsERNS0_17ClientReplicationERKNS0_12SyncProgressEyRKNSt3__16vectorINS0_11Transformer15RemoteChangesetENS8_9allocatorISB_EEEERNS0_11VersionInfoENS0_18DownloadBatchStateE + 149
9   librealm-wrappers.dylib             0x0000000111ad5ec5 _ZN5realm5_impl14ClientProtocol22parse_message_receivedINS_4sync10ClientImpl10ConnectionEEEvRT_NSt3__117basic_string_viewIcNS8_11char_traitsIcEEEE + 11509
10  librealm-wrappers.dylib             0x0000000111ad04f4 _ZN5realm4sync10ClientImpl10Connection33websocket_binary_message_receivedEPKcm + 52
11  librealm-wrappers.dylib             0x0000000111b319d6 _ZN12_GLOBAL__N_19WebSocket17frame_reader_loopEv + 1430
12  librealm-wrappers.dylib             0x0000000111b257bd _ZN5realm4util7network7Service9AsyncOper22do_recycle_and_executeINS0_14UniqueFunctionIFvNSt3__110error_codeEmEEEJRS7_RmEEEvbRT_DpOT0_ + 157
13  librealm-wrappers.dylib             0x0000000111b251cc _ZN5realm4util7network7Service14BasicStreamOpsINS1_3ssl6StreamEE16BufferedReadOperINS0_14UniqueFunctionIFvNSt3__110error_codeEmEEEE19recycle_and_executeEv + 140
14  librealm-wrappers.dylib             0x0000000111b27605 _ZN5realm4util7network7Service4Impl3runEv + 645
15  librealm-wrappers.dylib             0x00000001119c2140 _ZNSt3__1L14__thread_proxyINS_5tupleIJNS_10unique_ptrINS_15__thread_structENS_14default_deleteIS3_EEEEZN5realm5_impl10SyncClientC1ENS2_INS7_4util6LoggerENS4_ISB_EEEERKNS7_16SyncClientConfigENS_8weak_ptrIKNS7_11SyncManagerEEEEUlvE0_EEEEEPvSN_ + 176
8   librealm-wrappers.dylib             0x0000000111a9f162 _ZN5realm4sync10ClientImpl7Session29initiate_integrate_changesetsEyNS0_18DownloadBatchStateERKNSt3__16vectorINS0_11Transformer15RemoteChangesetENS4_9allocatorIS7_EEEE + 114
16  libsystem_pthread.dylib             0x00007ff8037ec4e1 _pthread_start + 125
2022-08-26 11:10:42.226 Info: Connection[2]: Connection closed due to error
17  libsystem_pthread.dylib             0x00007ff8037e7f6b thread_start + 15

Thanks
Luigi

Can you file a support ticket for this. It looks like a bug in the sync client or the server, but without the server logs, it’ll be next to impossible to track down.