If there is a texture parameter within a specific material attribute stream in the base material and also within the base material layer, they must have the same parameter group otherwise the parameters in an instance of the base material will disappear from the UI.
This was found when using normal and AO material attributes, though it may be more widespread in other material attributes.
During testing, this issue has only occurred with texture parameters and could not be reproduced with scalar or vector params.
To repro using the supplied project:
1. Open M_BaseMaterial. The BaseAO Param2D should have the grouping 06-Ambient Occlusion.
2. Open MI_BaseMaterial. There are three parameters in the 06-Ambient Occlusion section of the base material. A background layer and Layer1 is loaded in Layer Parameters.
3. Return to M_BaseMaterial and change the group of BaseAO Param2D to None and save.
4. Return to the MI_BaseMaterial. The BaseAO is moved to Global Texture Params and the other 2 params have disappeared.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-237791 in the post.