Reproduction steps:
1. Open the attached project
2. Select the "GameObject" GameObject in the Hierarchy window
3. Observe the Input Action field label under the "MB Class (Script)" component's "Class With Broken Name" field

Expected result: the Input Action is labeled according to its variable name
Actual result: the Input Action is labeled as "Input Action"

Reproducible with: 1.1.0-pre.5, 1.1.1, 1.2.0, 1.3.0 (2019.4.38f1, 2020.3.34f1, 2021.3.2f1, 2022.1.0f1, 2022.2.0a13)
Not reproducible with: 1.1.0-preview.3 (2019.4.38f1, 2020.3.34f1, 2021.3.2f1, 2022.1.0f1, 2022.2.0a13)

Note: using the Input System package version 1.3.0, the Serialized InputAction field, which is inside a class, which inherits the MonoBehaviour class, is labeled correctly, however, if the Serialized InputAction field is inside a Serialized non-MonoBehaviour class, it isn't