Thanks for the report! I confirmed that this is a recent regression and spent an afternoon looking into it. The fix has landed and should be deployed on Monday :)

This was an interesting bug so I figured I’d explain the fix below for anyone interested:

the issue boiled down to an async wrapper we had over the DataTransfer constructor that we were using to check osme other things before handling the DT. We were doing something like:

const data = event.clipboardData;

let text = data.getData(MIMETYPE_1);
await SomePromise();
if (text == null) {
  text = data.getData(MIMETYPE_2);
}
...

In this case MIMETYPE_1 was set when copying things from within WAWeb, and MIMETYPE_2 was text/plain, so basically any text copied from outside the app fell into this.

The issue was that by calling await we were switching into a different callstack, thus (presumably) triggering Fire