Opening previous session results in blank buffers

[Kyran-C]

Lately when I open a previously saved session, all my buffers will be blank with zero lines of text. The names, tabs, and window locations all restore correctly but the files act like they're empty. Even if I :wa the files aren't overwritten with nothing; opening them individually (after toggling off the workspace) shows the original content unchanged. Additionally, if I try to open a file via :e it only gives me options from my home directory rather than the project root directory that I launched neovim from.

I tried deleting the session file and starting from scratch, which worked for a while, but started doing the same thing again.

I'm using the latest stable Neovim 0.3.8, and everything is up to date via Plug.