Adobe Animate- Use of easing and warp assets break certain tweens, sometimes entire animation.

A few days ago, after perfect normal performance, Adobe Animate decided that new tweens in my short (~500 frame) animation would no longer ease using anything but classic. Everything (usually) looks normal in the viewport, but when published, the new frames don't have any tweens, or any of the deformations in their keyframes of movieclips, graphics, or most annoyingly: warped assets.
It's very strange behavior because it only affects new frames, and only after a certain point in the animation. I've rebuilt that section of the animation from scratch several times trying to fix this, including rebuilding the entireties of all warp assets, all the way from redrawing the bitmaps, and the behavior is the same-- it functions to a point, then new frames are glitchy.
I updated java, clean re-installed CC and animate...

I've tested completely blank new files: if I make a square shape, and classic tween it moving around, fine. but if i make it a warp asset, it usually has the glitchy movement or else blank screen. If I make it a warp asset with tweens a blank screen is always published. However, if I free draw a squiggly line and warp animate that, even with easing, it's fine?! I'm so baffled and I'm getting really frustrated with Adobe.

Not once have I been able to finish one of my many short projects in Animate before my file is inexplicably, and seemingly irreperably, damaged JUST before I've finished. I'm not a superstitious person, but this seems like very strange behavior. Please help me look into this, I pay a lot to earn this massive frustration X{

I have 32 gb ram, Radeon RX 5700, Ryzen 9 3900x 12 core...