all flyers like argentavis, pteranodon, quetzal, tapajara is stuck in the air and cannot move at all. tamed dinos before this bug happened works, can move and fly.

There are some problems in the beta version right now, fix coming ip later this week. Thx for reporting!

okay sorry about the late comment..

I've been testing the speed stats feature
wild flyers have 0 points on speed when wild BUT they get some points on speed upon taming, it's a really good improvement :)

I've also noticed that their speed stats will go back to 0 when they're cryopodded but their level would still be the same and they won't lose their points on speed

they lose all points of speed when I use commands to change imprinting but that doesn't really matter

That has to do with the fact that I introduced my own variable for the speed stat, effectively neutralising ('nulling') their original speed stat modifiers. It should not matter functionwise though, since the speed stat is recalculated each time a begin play event occurs. I'll see what I can come up with for the lost points on taming but that'll probably be a very tough nut to crack...

well it's already really good as it is right now, but is there a safe way to add this feature to the main mod without losing tamed flyers on the server ?

Yes, that will happen in the next update, which I hope to publish tomorrow.

Making progress on the update, hoping to finally publish tomorrow