[yocto] do_populate_sdk_ext always being triggered

[Andrea Galbusera]

I noticed that periodically running 'bitbake -c do_populate_sdk_ext' for an
image in my CI loop does always trigger the task to be executed even if no
changes where applied either to metadata or to the configuration between
two iterations. Is this expected? If so, why? Shouldn't SDK artifacts
exploit the sstate as i.e. images do?
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