wal: fix tsn calculations for mixed local/global space transactions

Closes tarantool#8746

src/box/wal.c

@@ -961,7 +961,7 @@ wal_assign_lsn(struct vclock *vclock_diff, struct vclock *base,
 	struct xrow_header **end = entry->rows + entry->n_rows;
 	struct xrow_header **first_glob_row = entry->rows;
 	/** Assign LSN to all local rows. */
-	for (struct xrow_header **row = start; row < end; row++) {
+	for (struct xrow_header **row = start; row <= end; row++) {
 		if ((*row)->replica_id == 0) {
 			/*
 			 * All rows representing local space data
@@ -988,11 +988,6 @@ wal_assign_lsn(struct vclock *vclock_diff, struct vclock *base,
 				first_glob_row = row;
 			}
 			(*row)->tsn = tsn == 0 ? (*start)->lsn : tsn;
-			/* Tx meta is stored in the last tx row. */
-			if (row == end - 1) {
-				(*row)->flags = entry->flags;
-				(*row)->is_commit = true;
-			}
 		} else {
 			int64_t diff = (*row)->lsn - vclock_get(base, (*row)->replica_id);
 			if (diff <= vclock_get(vclock_diff,
@@ -1009,9 +1004,17 @@ wal_assign_lsn(struct vclock *vclock_diff, struct vclock *base,
 			} else {
 				vclock_follow(vclock_diff, (*row)->replica_id, diff);
 			}
+			if (tsn == 0) {
+				tsn = (*row)->lsn;
+				first_glob_row = row;
+			}
+			(*row)->flags = 0;
+			(*row)->is_commit = false;
 		}
 	}
-
+			/* Tx meta is stored in the last tx row. */
+	*(end)->flags = entry->flags;
+	*(end)->is_commit = true;
 	/*
 	 * Fill transaction id for all the local rows preceding
 	 * the first global row. tsn was yet unknown when those