Server crashes trying to generate fireflies on full canopy trees

[WyattParker]

My friend had a fully grown canopy tree in her yard for several days (RL days, not MC days)
Eventually it became full of fireflies, no more room for more to generate. Server started crashing about every half hour generating this crash report:
https://mclo.gs/JZFt4zC
The crash report had me thinking about the tree, so i removed the Dynamic Trees Twilight Forest addon, started the server, all the fireflies were still there (too many to count, like....EVERY log from top to bottom. Removed the fireflies, readded the Twilight Forest addon, and server has been running for 2 hours so far with no more crashes.