IDE 2.0 beta.12 Compliles but won't upload - no errors

IDE 2.0 beta.12
Sketches compile with no errors, but they won't upload. After clicking "Upload" nothing happens, nothing appears in the Output pane. Board and port are detected correctly. No problems with Ver. 1.8.9.


This is a known bug. The instructions for the workaround are here:

It is being tracked by the Arduino IDE developers here:

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