"Temporal/Spectral Profile Tool"-plugin runs into a Python error (below: reports import error in last two lines, entire error message is 14 lines):

QGIS 3.16.13 on mac 10.15.7, running Qt 5.14.2, QWT 6.1.4. In QGIS 3.10 the plugin runs properly.

I haven't found any earlier posts on this issue.

Error message:

_import
  mod = _builtin_import(name, globals, locals, fromlist, level)
  ImportError: dlopen(/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/Pillow-7.2.0-py3.8-macosx-10.13.0-x86_64.egg/PIL/_imaging.cpython-38-darwin.so, 2): Library not loaded: /opt/X11/lib/libxcb.1.dylib
  Referenced from: /Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/Pillow-7.2.0-py3.8-macosx-10.13.0-x86_64.egg/PIL/_imaging.cpython-38-darwin.so
  Reason: image not found