What will happen to the temple work reserved by a member if that member passes away.
I am just another 'lowly' User/Patron ...
Just in passing ...
In regard to one's "List", of "Reservations", for "Temple" Work ...
Short Answer: The "Reservations" in you "List", will remain, 'as is' (ie. 'in-situ'); UNTIL, they EXPIRE.
UNLESS, another Member of your Family (or, EXTENDED Family), submits a "Request", for 'FamilySearch', to "Release", those "Reservations", HELD by you.
In other words ...
When one passes away, one's "Reservations", are NOT, automatically "Released",
I hope, that this may help/assist, somewhat.
Here is an article that will help explain this for you: