Posting this message here to formally add it to this thread,

Proof Against Poison Items/augments
Proof Against Disease items/augments
Protection from Evil items/potions/spell
Neutralize Poison potions/spell
Cure Disease potions/spell

are not correctly granting their 'immunities' as specified per each spell -
after much testing, the 'proof against' items are only providing the +# to saves and not
the immunity to natural poisons and diseases as they should

protection from evil is not providing the immunity to compulsions/charms/dominations as it should.

Neutralize Poison / Cure Disease potions/spell do not seem to be granting immunities in certain circumstances, where they used to.

This has been the case since one of the updates during the last year, perhaps since 2019.