STEPS TO REPRODUCE
snap run falkon                                                                                                                                                                              

Qt: Session management error: Could not open network socket
Qt WebEngine resources not found at /usr/share/qt5/resources. Trying parent directory...
Qt WebEngine resources not found at /usr/share/qt5. Trying application directory...
Qt WebEngine resources not found at /snap/falkon/74/usr/bin. Trying fallback directory... The application MAY NOT work.
Path override failed for key base::DIR_QT_LIBRARY_DATA and path '/home/alessio/snap/falkon/74/.falkon'
Installed Qt WebEngine locales directory not found at location /usr/share/qt5/translations/qtwebengine_locales. Trying application directory...
Qt WebEngine locales directory not found at location /snap/falkon/74/usr/bin/qtwebengine_locales. Trying fallback directory... Translations MAY NOT not be correct.
Path override failed for key ui::DIR_LOCALES and path '/home/alessio/snap/falkon/74/.falkon'
[0205/181407.674643:ERROR:icu_util.cc(251)] Couldn't mmap icu data file
zsh: trace trap (core dumped)  snap run falkon

OBSERVED RESULT
error associated with libicu-dev (for snap's content), app crashed
As for my Linux 5.4.0-91-generic x86-64 (ubuntu 18.04 based) ElementaryOS5.2 Hera it has libicu-dev!

EXPECTED RESULT
Launch of falkon's snap

SUMMARY
After update from 73 rev to 74 rev on SNAP I have crash on Falkon's lauch
Rev 73 rollback fixes problem. 
Debugging for snaps from me in too complex, excuse me.

SOFTWARE/OS VERSIONS
Linux/Pantheon:  Linux 5.4.0-91-generic x86-64  /  ElementaryOS5.2 Hera Pantheon-gtk3-based
(available in About System)
KDE Plasma Version:  X
KDE Frameworks Version:  X
Qt Version:  X

ADDITIONAL INFORMATION