Processing a list to output in a particular format

Question

I am processing a list to output its items in chunks separated by blank rows as follows. But the result is not working when there are similar items, as shown with the arrows.

The formula I'm using is =query(filter(flatten({if(COUNTIFS($A$1:$A,$A$1:$A,ROW($A$1:$A),"<="&ROW($A$1:$A))=1," ",),A1:A}),flatten({if(COUNTIFS($A$1:$A,$A$1:$A,ROW($A$1:$A),"<="&ROW($A$1:$A))=1," ",),A1:A})<>""),"offset 1",0)

I need some help with it, to get the repeated chunks right too, so that the desired result is following. I've tried tweaking the COUNTIF conditions but am struggling.

Desired result

Answer 1

try:

=INDEX(LAMBDA(a, QUERY(FLATTEN(SPLIT(QUERY(IFERROR(
 IF(a={""; a},"×"&a,"×​×"&a)),,9^9), "×")), "offset 1", ))
 (A1:INDEX(A:A, MAX(ROW(A:A)*(A:A<>"")))))

Answer 2

When I opened it, there was no answer but here it goes all the same for you or another user 😉

It checks each row with the next one and adds a "|" when they differ, then joins all rows with that same symbol and split by that same symbol, resulting in empty rows between different values

=transpose (split(join("|",byrow(A1:A,lambda(each,if(each="","",SI(each=offset(each,1,0),each,each&"|"))))),"|",1,0))

Answer 3

Here's another solution:

=index(lambda(a,b,query(flatten(split(
a&if(a=b,,"❆ "),"❆")),"where Col1<>''"))
(filter(A:A,A:A<>""),{filter(A2:A,A2:A<>"");0}))