[warning] Trying to access array offset on value of type bool PluginBase.php:185

Also happens on v9.5.2

Recreated #2 as a patch because I'm not sure about installing from a core fork

An in-depth description of the issue and the recommendation can be found on this comment 🐛 [warning] Trying to access array offset on value of type bool PluginBase.php:187 Needs work on a similar issue.

9.3 is no longer a supported version. Current development branch is 11.x

Think it should be investigated why it is sometimes a boolean, don't want to put a patch over a larger problem.

The step "Create a views plugin that does not implement the correct options array structure." makes me think it was a user error.

As a bug will need test case showing the issue.