If an entity implements bundle support using a plugin handler, rather than using entity storage, multiple places in the code generate a WSOD.
In my use case, I'm working on upgrading gcommerce to support 2.x and 3.x of group. The commerce_license module implemented bundles using plugins.
When you attempt add new or existing entities to the group, you get a WSOD.
Similarly, if you access the groupOperations, e.g. by adding the group block to the block layout and visit a page with that block, you also encounter issues.
The entity type bundle info service abstracts this out, allowing support for both storage and plugin based bundles.
Patch to follow.
The current group operations dropdown button only displays the bundle name, rather than entity type of bundle name. The patch will address that, as well.
Needs review
3.2
Code
The last submitted patch, 2: use-entity-type-bundle-info-service-3379174-2.patch, failed testing. View results →
Merge Request is for 3.2.x.
Patch in #5 works with 2.1.x