Stellaris - Ships that should win combat getting instantly deleted

[little3skulls]

Description
The way the bug report forum is laid out doesn't make sense. What goes in this box? Why are you asking for the description twice?

Game Version
3.4

What version do you use?
Steam

What expansions do you have installed?
All of them

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
I don't have much information about this, other than a reddit post I made asking about it and getting confirmation that I'm not the only person experiencing this. Occasionally when you enter combat where you have 150% or more of the fleet power of the enemy your fleets get instantly deleted when they enter combat. I had it happen twice, once I moved group of fleets that combined to about 100k into a system where I had a 20k starbase fighting a 30k enemy fleet. My ships all entered the hyperlane at the same time, but got deleted once they entered combat. They didn't even enter emergency ftl, they just vanished. That cost me the match, so I started over, only to have nearly the exact same situation happen, with all the fleets being at about half the strength they were when it last happened. The second time I had 1 fleet that wasn't in combat and that was the only fleet I had left after the rest got deleted

Also the bug report thing on the forums doesn't make any sense the way it is laid out. I had to edit this post after it was posted to include everything properly

Steps to reproduce the issue.
Unable to reproduce on demand

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File(s) attached

 

[Dracupuncture]

I too had a fleet disappear under mysterious circumstances. it was relatively late game so i just rebuilt but it was annoying.

edit: this was prior to overlord

 

[Kougar]

I had a Marauder Raiding fleet enter my space... then instantly vanish for no reason, even though no starbases were in the area. I assumed they were destroyed, but a few minutes later the same raiding fleet re-appeared from an entirely different path to my territory some distance away requiring my fleet to path the long way around another empire's space to deal with them. No idea what happened there, maybe it's related.