IJ: Downloading/attaching SDK sources doesn't seem to work

I know this problem has been existing on and off for a long time. I think this used to work the last time I had to maintain our plugin (which was a few months ago).

But today, no luck.

I do have the setting enabled:

Then I do Download Sources, and then Sync All Gradle Projects:

Then I try to navigate to this method:

And this is where I land:

Ideas?

We are delivering a proper fix soon https://youtrack.jetbrains.com/issue/IJPL-246844