I just looked at one of my 32 bit machines (a Dell D610) and it has a snap directory that lists under it a 168 directory, a common directory and a current directory. Does your snap directory look at all similar?
I updated my 32 bit ubuntu-mate, rebooted and used the Control Center to try to start the Software Boutique. It hung as you reported. The Boutique was functional back in September.
Apport developed an error report after waiting for a bit. I sent it off (apport asks permission to do this). The Software Boutique window remained white and not populated with possible programs to install.
I rebooted and tried launching the Boutique again. Same deal, no workee. Apport shows a failure in the ExecutablePath - /usr/lib/i386-linux-gnu/webkit2gtk-4.0/WebKitProcess Package libwebkit2gtk-4.0-37 2.22.2-0ubuntu0.18.04.2 and much more.
Please file a bug report on this.