Bug: “No such executable in PATH: (null)” when loading extension

Summary
When an extension has a Shell Script File, and the file has its executable bit set, the extension will fail to load with the message: “No such executable in path: (null)”

Versions
PopClip 2021.11, all macOS versions
(was fine in 2021.10)

Steps to reproduce

  1. Create .popclipext extension with a shell script action
  2. Set the executable bit on the shell script file using chmod +x
  3. Attempt to install the extension

Expected result
Extension should install

Actual result
Error shown as described above.

Notes
Workaround is to either remove the executable bit with chmod -x, or specify a Script Interpreter.

Fix
Fixed in PopClip Build 3790.