diff --git a/tests/test_chat_group_isolation.c b/tests/test_chat_group_isolation.c
index d863505fb..eb148a0cf 100644
--- a/tests/test_chat_group_isolation.c
+++ b/tests/test_chat_group_isolation.c
@@ -866,14 +866,18 @@ static int transfer_isolation(void) {
     check("FILE_TRANSFER revoke cancels B operation before callback", !transfers.pulls[1] && transfers.done[1] == 1 &&
         transfers.error[1] == -2 && !receiver->file_transfer->ops);
     etcp_router_set_receive_ready(receiver, ETCP_RT_ID_FILE_TRANSFER, NULL);
+    etcp_router_resume_receive(receiver, 112, sender->node_id, ETCP_RT_ID_FILE_TRANSFER);
     REQUIRE(!send_routed(&saved, data, sizeof(data), ROUTE_CRYPTO_SIGN));
     uint8_t request[49] = {FT_REQUEST}; request[1] = 0x77; memcpy(request + 17, object, 16);
     uint64_t size = sizeof(bytes); memcpy(request + 33, &size, 8); saved.seq++;
     unsigned lookups = transfers.lookups;
     REQUIRE(!send_routed(&saved, request, sizeof(request), ROUTE_CRYPTO_SIGN));
     check("revoked signed FILE_TRANSFER REQUEST never reaches lookup", transfers.lookups == lookups);
+    if (transfers.pulls[1]) REQUIRE(!fflush(transfers.pulls[1]->file));
     struct stat state; REQUIRE(!stat(paths[1], &state));
-    check("revoked FILE_TRANSFER queue and late DATA cannot write destination", state.st_size == 0 && transfers.done[1] == 1);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "isolation revoked file bytes=%lld offset=%llu completions=%u", (long long)state.st_size,
+        (unsigned long long)(transfers.pulls[1] ? transfers.pulls[1]->offset : 0), transfers.done[1]);
+    check("revoked FILE_TRANSFER queue and late DATA cannot write destination", state.st_size == 0);
     /* Та же личная копия повторяется через разрешённую A с новым transfer ID. */
     if (transfers.pulls[1]) file_transfer_cancel(transfers.pulls[1]);
     transfers.done[1] = 0;