Module Review observer executes ->load() on products collection

[lbajsarowicz]

Preconditions

1. Magento 2.1.7
2. PHP 7.0.22
3. Module Review enabled

Steps to reproduce

Problem occured when tried to inject own filters into products collection.

1. Build own Observer that runs on
   catalog_block_product_list_collection event
2. Try to use
   $productCollection = $observer->getEvent()->getCollection();
3. Then try execute
   $productCollection->addAttributeToFilter('entity_id', ['in' => $fancyIds]);

Expected result

1. Products collection should be filtered to provided IDs
2. Products collection should not be loaded too early

Actual result

1. Exception message saying that Collection is already loaded

Temporary workaround

I disabled Review observer:

<!-- Disabled because of ->load() bug on product collection in Review module -->
<observer name="review" disabled="true" />

[orlangur]

Please clarify what exactly you call a bug here and approximate approach how would you fix it.

Build own Observer that runs on catalog_block_product_list_collection event

Does not look like an appropriate event is used here, some before_load of product collection seems to be a better choice.

[magento-engcom-team]

@lbajsarowicz we are closing this issue due to inactivity. If you'd like to update it, please reopen the issue.

[PivitParkour94]

So what's the solution to this?