[v15 beta] pg_upgrade failed if earlier executed with -c switch

Hi,

While performing pg_upgrade from v15Beta binaries/source,
I got this error below error

could not create directory "d2/pg_upgrade_output.d": File exists
Failure, exiting


Steps to reproduce
v15 Beta sources
initalize a cluster ( ./initdb -D d1)
initalize another cluster ( ./initdb -D d2)
run pg_upgrade with -c option  ( ./pg_upgrade -d d1 -D d2 -b . -B . -c -v)
run pg_upgrade without -c option ( ./pg_upgrade -d d1 -D d2 -b . -B .)
--
--
--
Error


This behavior was not there in earlier released versions, i guess.
Is it expected behavior now onwards?

-- 
regards,tushar
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