Order of SQL files execution seems corrupted:

dbupdate-7.4.0-to-7.5.0.sql
dbupdate-7.4.4-to-7.4.5.sql
dbupdate-7.5.2-to-7.5.3.sql
dbupdate-7.5.3-to-8.0.0.sql
dbupdate-7.5.4-to-7.5.5.sql

We need to indicate 8.0 schema updates have to be executed after 7.5.x updates.

Solution would be to make: dbupdate-7.5-latest-to-8.0.0.sql and keep it up to date with 8.0 changes till release.