Wrong address when cleaning freespace blocks multiple times

[TheBiob]

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I came across this in GPS where for some reason two label in different freespace blocks had the same address. The simples test case I could find is creating a rom with

check bankcross off
org $008000 : rep $80000 : db $00

and then patching

print "previous test1: $",hex(read3($008000+1))
print "previous test2: $",hex(read3($008004+1))
print "new test1: $",hex(test1)
print "new test2: $",hex(test2)

org $008000
autoclean JML test1

org $008004
autoclean JML test2

freecode
test1: db 1

org $008008
autoclean JML test1

freecode
test2: db 2

twice which prints the following:

first run:
previous test1: $0
previous test2: $0
new test1: $908008
new test2: $908011

second run:
previous test1: $908008
previous test2: $908011
new test1: $908008
new test2: $908008

on the second run, both test1 and test2 have the same address even though they're supposed to be in separate freespace blocks.

edit: I should probably specify that this only happens if you one autoclean is before the freespace command and one after and then another freespace is requested.

Playing around with this a bit more: If test1 is cleaned, then requested then another freespace block is requested and then test1 is cleaned again asar throws an error (E5136): Don't autoclean a label at the end of a freespace block, you'll remove some stuff you're not supposed to remove. [autoclean JML test1]