GLR before 2016 would remove lost object types as part of L and R. After 2016, CaseTalk not longer removed lost Object Types as part of L or R.
The removal of Lost Object Types is described in the FCO-IM book in the lexicalizing chapter.

Lexicalization speaks of Object Types which lose their OTE, and therefor their Tuples, and finally should be removed. When (R) is turned off, these do not disappear from the IGG file. However there are two R variants.

(R) Reduce if the constraints guarantee the population is elsewhere already. We may lose a small amount of type information.
(r) Remove lost object types which contain no OTE played anywhere else.

A (r) option in the GLR dialog would be helpful.