If you press CLR it will clear FAIL and move SHUTDOWN up, except if TCAS is only in TA.
As "TCAS mode selector.....TA" is an actionable item, ECAM won't automatically clear.
Doing resets and practice engine failures in the sim it is easy to forget to reset TCAS to TA/RA which is probably why some have seen the ECAM clear to the next underline item.
Whether you clear the FAIL part or not would be company SOP.