The "catch" sounds almost like disconnector or disconnector cut-out on slide.
For the fun of it, swap some parts out with another.
Start with disconnector and sear first.
Then the grip safety.
No telling who or what attacked the insides.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)