How to reproduce:
plant a chorus flower on end stone
replace all air blocks next to the chorus plant with structure void blocks using a command similar to this one: /fill ~8 ~10 ~8 ~-8 ~-10 ~-8 structure_void replace air
This bug makes it hard to save structures containing chorus plants with structure blocks.
Confirmed. This might be intended. However, cacti don't break when there are structure voids around them, suggesting that structure voids should act like air when interacting with other blocks.