This problem seems to stop at Check in HLSLMaterialTranslator.h. If the same value is entered in MCT_Float and MCT_Float4, it branches to True with IsIdentical, but it seems that a problem has occurred due to type check.
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It crashes by creating a material like the image below.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-67415 in the post.
| 0 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 4.20, 4.21 |
| Target Fix | 4.23 |
| Created | Dec 11, 2018 |
|---|---|
| Resolved | Dec 12, 2018 |
| Updated | Jul 25, 2019 |