I just got a Raven scanner and am having the same issues as well on 6.11.5. According to the logs, it looks like there is a problem with a file lock and the Samba service is crashing:
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843490, 0] ../../source3/smbd/close.c:312(close_remove_share_mode)
Mar 6 14:51:29 Orthanc smbd[2882]: close_remove_share_mode: Could not get share mode lock for file Paperless/Consumption/raven-test-file.txt
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843575, 0] ../../source3/smbd/fd_handle.c:39(fd_handle_destructor)
Mar 6 14:51:29 Orthanc smbd[2882]: PANIC: assert failed at ../../source3/smbd/fd_handle.c(39): (fh->fd == -1) || (fh->fd == AT_FDCWD)
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843586, 0] ../../lib/util/fault.c:173(smb_panic_log)
Mar 6 14:51:29 Orthanc smbd[2882]: ===============================================================
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843596, 0] ../../lib/util/fault.c:174(smb_panic_log)
Mar 6 14:51:29 Orthanc smbd[2882]: INTERNAL ERROR: assert failed: (fh->fd == -1) || (fh->fd == AT_FDCWD) in pid 2882 (4.17.3)
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843602, 0] ../../lib/util/fault.c:178(smb_panic_log)
Mar 6 14:51:29 Orthanc smbd[2882]: If you are running a recent Samba version, and if you think this problem is not yet fixed in the latest versions, please consider reporting this bug, see https://wiki.samba.org/index.php/Bug_Reporting
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843608, 0] ../../lib/util/fault.c:183(smb_panic_log)
Mar 6 14:51:29 Orthanc smbd[2882]: ===============================================================
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843612, 0] ../../lib/util/fault.c:184(smb_panic_log)
Mar 6 14:51:29 Orthanc smbd[2882]: PANIC (pid 2882): assert failed: (fh->fd == -1) || (fh->fd == AT_FDCWD) in 4.17.3
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843816, 0] ../../lib/util/fault.c:292(log_stack_trace)
Mar 6 14:51:29 Orthanc smbd[2882]: BACKTRACE: 32 stack frames:
Mar 6 14:51:29 Orthanc smbd[2882]: #0 /usr/lib64/libgenrand-samba4.so(log_stack_trace+0x2e) [0x149a4d08764e]
Mar 6 14:51:29 Orthanc smbd[2882]: #1 /usr/lib64/libgenrand-samba4.so(smb_panic+0x9) [0x149a4d0878a9]
Mar 6 14:51:29 Orthanc smbd[2882]: #2 /usr/lib64/libsmbd-base-samba4.so(+0x4d10b) [0x149a4d46810b]
Mar 6 14:51:29 Orthanc smbd[2882]: #3 /usr/lib64/libtalloc.so.2(+0x44df) [0x149a4d0374df]
Mar 6 14:51:29 Orthanc smbd[2882]: #4 /usr/lib64/libsmbd-base-samba4.so(file_free+0xd6) [0x149a4d4752e6]
Mar 6 14:51:29 Orthanc smbd[2882]: #5 /usr/lib64/libsmbd-base-samba4.so(close_file_free+0x29) [0x149a4d4a5d49]
Mar 6 14:51:29 Orthanc smbd[2882]: #6 /usr/lib64/libsmbd-base-samba4.so(+0x5d046) [0x149a4d478046]
Mar 6 14:51:29 Orthanc smbd[2882]: #7 /usr/lib64/libsmbd-base-samba4.so(+0x5d192) [0x149a4d478192]
Mar 6 14:51:29 Orthanc smbd[2882]: #8 /usr/lib64/libsmbd-base-samba4.so(files_forall+0x19) [0x149a4d474119]
Mar 6 14:51:29 Orthanc smbd[2882]: #9 /usr/lib64/libsmbd-base-samba4.so(file_close_conn+0x44) [0x149a4d474184]
Mar 6 14:51:29 Orthanc smbd[2882]: #10 /usr/lib64/libsmbd-base-samba4.so(close_cnum+0x67) [0x149a4d4c0fd7]
Mar 6 14:51:29 Orthanc smbd[2882]: #11 /usr/lib64/libsmbd-base-samba4.so(smbXsrv_tcon_disconnect+0x4e) [0x149a4d4f41de]
Mar 6 14:51:29 Orthanc smbd[2882]: #12 /usr/lib64/libsmbd-base-samba4.so(+0xbbe92) [0x149a4d4d6e92]
Mar 6 14:51:29 Orthanc smbd[2882]: #13 /usr/lib64/libtevent.so.0(tevent_common_invoke_immediate_handler+0x17a) [0x149a4d04acfa]
Mar 6 14:51:29 Orthanc smbd[2882]: #14 /usr/lib64/libtevent.so.0(tevent_common_loop_immediate+0x16) [0x149a4d04ad16]
Mar 6 14:51:29 Orthanc smbd[2882]: #15 /usr/lib64/libtevent.so.0(+0xea7b) [0x149a4d050a7b]
Mar 6 14:51:29 Orthanc smbd[2882]: #16 /usr/lib64/libtevent.so.0(+0xcd77) [0x149a4d04ed77]
Mar 6 14:51:29 Orthanc smbd[2882]: #17 /usr/lib64/libtevent.so.0(_tevent_loop_once+0x91) [0x149a4d049b61]
Mar 6 14:51:29 Orthanc smbd[2882]: #18 /usr/lib64/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x149a4d049e3b]
Mar 6 14:51:29 Orthanc smbd[2882]: #19 /usr/lib64/libtevent.so.0(+0xcd17) [0x149a4d04ed17]
Mar 6 14:51:29 Orthanc smbd[2882]: #20 /usr/lib64/libsmbd-base-samba4.so(smbd_process+0x817) [0x149a4d4bece7]
Mar 6 14:51:29 Orthanc smbd[2882]: #21 /usr/sbin/smbd(+0xb090) [0x555b64eda090]
Mar 6 14:51:29 Orthanc smbd[2882]: #22 /usr/lib64/libtevent.so.0(tevent_common_invoke_fd_handler+0x91) [0x149a4d04a791]
Mar 6 14:51:29 Orthanc smbd[2882]: #23 /usr/lib64/libtevent.so.0(+0xec87) [0x149a4d050c87]
Mar 6 14:51:29 Orthanc smbd[2882]: #24 /usr/lib64/libtevent.so.0(+0xcd77) [0x149a4d04ed77]
Mar 6 14:51:29 Orthanc smbd[2882]: #25 /usr/lib64/libtevent.so.0(_tevent_loop_once+0x91) [0x149a4d049b61]
Mar 6 14:51:29 Orthanc smbd[2882]: #26 /usr/lib64/libtevent.so.0(tevent_common_loop_wait+0x1b) [0x149a4d049e3b]
Mar 6 14:51:29 Orthanc smbd[2882]: #27 /usr/lib64/libtevent.so.0(+0xcd17) [0x149a4d04ed17]
Mar 6 14:51:29 Orthanc smbd[2882]: #28 /usr/sbin/smbd(main+0x1489) [0x555b64ed7259]
Mar 6 14:51:29 Orthanc smbd[2882]: #29 /lib64/libc.so.6(+0x23177) [0x149a4ce55177]
Mar 6 14:51:29 Orthanc smbd[2882]: #30 /lib64/libc.so.6(__libc_start_main+0x85) [0x149a4ce55235]
Mar 6 14:51:29 Orthanc smbd[2882]: #31 /usr/sbin/smbd(_start+0x21) [0x555b64ed7b31]
Mar 6 14:51:29 Orthanc smbd[2882]: [2023/03/06 14:51:29.843913, 0] ../../source3/lib/dumpcore.c:315(dump_core)
Mar 6 14:51:29 Orthanc smbd[2882]: dumping core in /var/log/samba/cores/smbd
I'm going to look around and see if I can find any more info about this or how to fix (or hopefully it's fixed in a newer version of Samba). I will try using FTP for now as a workaround, but hopefully this can be resolved.