DbContext disposed in Admin only when updating/deleting an item (post v3.8 to v3.9 migration)

Hi.

Could someone give me a hint on this issue.

DbContext is disposed in Admin when updating/deleting an item(category or manufacturer etc...)

I couldn't find the answer in the forum.

When customer is the entity, EfRepository.Update() is calling _context.SaveChanges() successfully returning a >0 value for the changed entity, but when the entity is category, 0 is returned and the DbContext is disposed

What would cost the context to be prematurally disposed?

PS: The DependencyRegistrar for IDbContext has InstancePerLifetimeScope() set

Thanks guys