Don't see it as hit or miss, the version on the Ubuntu beta image only shows snaps.
On an older install it has snap-store 20200401.4cde4f1 which shows both snaps and .deb's
Refreshing the beta image install's snap-store from latest/stable: 20191114.a9948d5 to latest/beta: 20200403.d6b9c02 then allows the snap-store to show both snaps and .deb's.
Don't see it as hit or miss, the version on the Ubuntu beta image only shows snaps.
On an older install it has snap-store 20200401.4cde4f1 which shows both snaps and .deb's
Refreshing the beta image install's snap-store from latest/stable: 20191114.a9948d5 to latest/beta: 20200403.d6b9c02 then allows the snap-store to show both snaps and .deb's.