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If I move a file from Ps to AI, the color in AI changes to a pastel color. Color swatches all change too. And cannot Undo and the file is broken accordingly.
Just to get it out of the way first:
That said, this looks more like an error in the conversion between those two profiles. And that conversion is performed in the GPU nowadays (used to be the CPU). In other words - a GPU bug. Here's a smoking gun:
Not much you can do about GPU bugs on Mac, except wait for an OS update. In the meantime, you can see if "deactivate native canvas" in PS Preferences helps. That's not a fix, but it may be a temporary workaround until a fix comes.