[yocto] task is executed even when sstate-cache md5 matches

[Pepe Perez]

I have following siginfo packages:
Generated in my build sstate-cache
build/sstate-cache/be/sstate:proc-fifo::1.0.3:r1::3:be9c419f0caa05042d43c03d576d2e15_fetch.tgz.siginfo
Previously existing in my build SSTATE_MIRRORS:
/central/sstate-cache/be/sstate:proc-fifo::1.0.3:r1::3:be9c419f0caa05042d43c03d576d2e15_fetch.tgz.siginfo

I had many other targets where setscene was successful and no task was executed. Why fetch is executed in the target above, if md5 is a match?
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