Describe the bug

The FEL laser seems to flicker, rendering the SILEX unusable since it can't complete the process

video:

I found a workaround: it works when standing with the back on the laser and opening the silex from there

glass over the laser makes no difference

I also have this problem in my server, maybe it's caused by a network problem?

Thermos servers are known to have this fantastic feature that is on by default where all tile entities that are not in a chunk that has a player in it only tick once a second instead of once per tick. If you happen to be on a server, either change its config for tile entity ticking or disable this "optimization" feature outright, if not then it might be an issue on my end.

Editing the tileentities.yml file and disabilng the optimization on FEL and SILEX seems to have solved the issue, thanks!