Pub, Sub:
CREATE TABLE conf_tab_numeric_big (a int PRIMARY KEY, b numeric);

Pub:
INSERT INTO conf_tab_numeric_big VALUES (1, 1e15000::numeric);

Sub:
DELETE FROM conf_tab_numeric_big WHERE a = 1;

Pub:
UPDATE conf_tab_numeric_big SET b = 1e50000::numeric WHERE a = 1;

Seee the length:
postgres=# SELECT length(remote_tuple->>'b') from pg_conflict.pg_conflict_log_16400 where relname = 'conf_tab_numeric_big';
 length 
--------
  50001

It is not omitted and logged fully in CLT.