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The first part was stolen from 72251ce78c061 on the maint-5.18 branch.
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The thing about locking hash keys inside the substitution and
vivifying globs is too hard to explain clearly and concisely.
This section is entitled ‘*Selected* Bug Fixes’, after all.
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Stop reset from clearing aliases to globs

If $z has been aliased to *foo, then reset("z") would turn off the
SvOK flags on *foo, putting it in an inconsistent state.  This could
cause crashes.
perldelta for #3330/8140a7a