019-5 Crab death bug?

Description of Bug: when trying to make a nest/hive, you need to fuse 4 019-5 together to make it, problem is once youre at 3/4 the crab randomly dies 30 to a miniute later.
Reproducible?: Yes
If yes, describe how to reproduce: fuse 3 019-5 together and wait

How much does it affect gameplay: Major, eats up bio mass for no gain
Additional Information: makes playing 019 very unfun at times waiting 40 minutes for that to happen