Firstly, the Sprites are missing,

And this mod doesnt work with beacon rebalnce: (when placingg flares)

The mod Beacon Rebalance (2.0.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event wret-beacon-rebalance-mod::on_built_entity (ID 6)
wret-beacon-rebalance-mod/control.lua:56: attempt to index a nil value
stack traceback:
wret-beacon-rebalance-mod/control.lua:56: in function <wret-beacon-rebalance-mod/control.lua:47>

Based on the error message, this may be more of a problem on the Beacon Rebalance side. It looks like they may be potentially referencing a nil value, but they aren't accounting for that correctly in their "on_built_entity" function

That's an issue with Beacon Rebalance. I already posted a report on that mod's page:

https://mods.factorio.com/mod/wret-beacon-rebalance-mod/discussion/67211945219459dcd4befd6a

Long story short, one of the ways in which that mod attempts to change the Vanilla Beacon is still using the outdated 1.1 format, which now returns nil values.