Reply to All - truncate recipient in cc field

Hi all,

If I choose “Reply to all”, (no matter Reply, Reply with History…), in the cc field, the recipients will be truncated :

Original -

“user 1” user_1@abc.com,

“user 2” user_2@def.com,

“user 3” user_3@def.com

Then it becomes -

“user 1” user_1@abc.com, “user 2” <user_2>

Start from the @ of the second user, all remainings disappeared.

But it doesn’t happen to all mail. In additions, I already done replace design, refresh design and fixup.

Any idea? Please help. Thanks!