How to reproduce:
1. Download and extract the attached "Bundle.zip" file
2. Navigate to <...>\case_1252232-Bundle\Bundle folder
3. Run this command to build Asset Bundle(instead of <path to version> type in the path to your 2018.4.23f1 version):

start-process "build-bundle-in-ver.bat" "<path to version>\editor"

4. After the build finishes run this command(instead of <path to version> type in the path to your 2018.4.9f1 version):

start-process "load-loader-in-ver.bat" "<path to version>\editor"

5. Enter Play Mode

Expected Behavior: The shader is working (attached screenshot "expected.png")
Actual Behavior: The shader is not working, the terrain is dark (attached screenshot "actual.png")

Reproducible with: 2018.4.16f1, 2018.4.23f1
Not Reproducible with: 2018.4.15f1

Note: There are path examples provided in the initial user's description. The report was tested only on the LTS, where it was introduced. The developer said that he will fill in the rest of the information if it is needed.