Public bug reported:

On focal with:

Platform Linux-5.4.0-52-generic-x86_64-with-glibc2.29
Qt       5.12.8
Python   3.8.5
PyQt     5.14.1
Sip      4.19.21

The QImageReader and QImageWriter doesn't support the TIFF format.
The TIFF format was always supported in other versions.

QImageReader.supportedImageFormats()
[PyQt5.QtCore.QByteArray(b'bmp'), 
PyQt5.QtCore.QByteArray(b'cur'), 
PyQt5.QtCore.QByteArray(b'gif'), 
PyQt5.QtCore.QByteArray(b'ico'), 
PyQt5.QtCore.QByteArray(b'jpeg'), 
PyQt5.QtCore.QByteArray(b'jpg'), 
PyQt5.QtCore.QByteArray(b'pbm'), 
PyQt5.QtCore.QByteArray(b'pgm'), 
PyQt5.QtCore.QByteArray(b'png'), 
PyQt5.QtCore.QByteArray(b'ppm'), 
PyQt5.QtCore.QByteArray(b'svg'), 
PyQt5.QtCore.QByteArray(b'svgz'), 
PyQt5.QtCore.QByteArray(b'xbm'), 
PyQt5.QtCore.QByteArray(b'xpm')]
        
print(QImageWriter.supportedImageFormats()
[PyQt5.QtCore.QByteArray(b'bmp'), 
PyQt5.QtCore.QByteArray(b'cur'), 
PyQt5.QtCore.QByteArray(b'ico'), 
PyQt5.QtCore.QByteArray(b'jpeg'), 
PyQt5.QtCore.QByteArray(b'jpg'), 
PyQt5.QtCore.QByteArray(b'pbm'), 
PyQt5.QtCore.QByteArray(b'pgm'), 
PyQt5.QtCore.QByteArray(b'png'), 
PyQt5.QtCore.QByteArray(b'ppm'), 
PyQt5.QtCore.QByteArray(b'xbm'), 
PyQt5.QtCore.QByteArray(b'xpm')]

** Affects: pyqt5 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1904396

Title:
  TIFF image format missing

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