On value Changed Functions dynamic variable functions show missing

[Dameon]

Unity has addressed this in UnityEvent with dynamic parameters not showing anymore in the Unity inspector

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Hello! This issue sounds very similar to another issue: Unity Issue Tracker - UnityEvent drawer no longer handles events in non-public fields correctly

This issue is already fixed in 2020.1.0a5, 2019.3.0b4 and above. Also, there is a backport opened for a review for 2019.2 stream. To work around this issue, you’ll have to upgrade to specified versions or above, or use 2019.2.4f1, since the regression was indeed introduced in 2019.2.5f1