Man pages matching name moosex::attributehelpers::methodprovider::immutablehash in section 3pm:

MooseX::AttributeHelpers::MethodProvider::ImmutableHash.3pm.en	debian 10 / libmoosex-attributehelpers-perl
MooseX::AttributeHelpers::MethodProvider::ImmutableHash.3pm.en	debian 11 / libmoosex-attributehelpers-perl
MooseX::AttributeHelpers::MethodProvider::ImmutableHash.3pm.en	debian 12 / libmoosex-attributehelpers-perl