Create Cursor abcd (abc C(10))
insert into abcd values('xyz')
insert into abcd values('xyz1')
cursorsetprop("buffering",5)
insert into abcd values('xyz2')
insert into abcd values('xyz3')
replace abc WITH 'xyz4' FOR abc='xyz1'
select  0
select * from abcd with (buffering = .t.) WHERE !EMPTY(CHRTRAN(GETFLDSTATE(-1),"1",""))
?"with chrtran :" +Transform(_tally)
select * from abcd with (buffering = .t.) WHERE RECNO()<0
?"From buffer New records :" +Transform(_tally)

returns
with chrtran :0    ?? should be 3 ?
From buffer  New records:2 

also I tried with this

close all
Create Cursor abcd (abc C(10))
insert into abcd values('xyz')
insert into abcd values('xyz1')
cursorsetprop("buffering",5)
insert into abcd values('xyz2')
insert into abcd values('xyz3')
replace abc WITH 'xyz4' FOR abc='xyz1'
select  0
select * from abcd with (buffering = .t.) WHERE !EMPTY(CHRTRAN(GETFLDSTATE(-1,"abcd"),"1",""))
?"with chrtran :" +Transform(_tally)
select * from abcd with (buffering = .t.) WHERE RECNO()<0
?"From buffer :" +Transform(_tally)

RETURNS

with chrtran :4  ?? should be 3 ?
From buffer  New records:2  


Also consider this ?

close all
Create Cursor abcd (abc C(10))
cursorsetprop("buffering",5)
insert into abcd values('xyz')
insert into abcd values('xyz1')
tableupdate(2,.t.,"abcd")
insert into abcd values('xyz2')
insert into abcd values('xyz3')
replace abc WITH 'xyz4' FOR abc='xyz1'
tablerevert(.t.,"abcd")
select  0
select * from abcd with (buffering = .t.) WHERE !EMPTY(CHRTRAN(GETFLDSTATE(-1,"abcd"),"1",""))
?"with chrtran :" +Transform(_tally)
select * from abcd with (buffering = .t.) WHERE RECNO()<0
?"From buffer :" +Transform(_tally)

Returns
with chrtran :2  ?? should be 0 ?
From buffer  New records:0