Does orbit decay exist in simplerockets2

I actually found a bug that causes craft to deorbit,the bug works like this:
If you eva a droonought and attach tether to the craft and keep in extending while spinning the craft it slowly falls back to droo.this bug may not exist now i saw it in older version

no

Sort of. If you don’t use time warp for a very long time you will notice your orbit changing ever so slightly, typically getting low. Eventually you could deorbit, but it is very unlikely. The game solidifies your orbit when using time warp. This is only changed when using ion engines. But the game, in order to reduce the load on your computer, confines the atmosphere to a range of altitude. This means it is easier to get in orbit and stay in orbit. And another thing is that it only calculates gravity for the parent body.