i dont know if this is fixed in 1.16 but i have problem with new light engine, i do satysfying redstone lamp machine but i hate when this happened (btw sry for english, english isnt my first languague)

This issue is Incomplete 
Your report does not contain enough information, as such, we are unable to understand or reproduce the problem.

do crazy things with redstone, just do some repeaters and it can show idk

This report is still incomplete.

We do not have enough information to find the cause of this issue.

Please record a video of this happening and attach it to this report.
If you are on Windows, you can use Windows+Alt+R to open a built-in App for recording game footage.
In case you don't have a program to record videos, we recommend using the free recording software OBS.
In case the resulting video file is too large to be uploaded to the bug tracker directly, please upload it elsewhere (e.g. as unlisted video on YouTube) and link to it here.

_{This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki