For some reason, maps in open apoc always seem to generate the same for each building; most noticeably in the slums
For example, this is the only slum map i tend to see
It appears that something has changed since the variety of maps Istrabel was able to show in his videos throughout 2017 that gave a wide variety of possibilities

A long awaited update to this article
Having played the OG and Beta2 many times over recent months, there are significantly more slum maps that OpenApoc does not generate
Some are listed here on the Stun Raid section of the wiki
https://www.ufopaedia.org/index.php/Stun_Raid
Additionally, it appears OpenApoc is not making the full range of other maps available for other building types and I shall therefore create another issue and reference this one....
Issue #630 is more comprehensive with regards to map generation issues in OpenApoc
Istrebitel was never able to finish the improved generator before leaving the project
Please see his messages there
Most helpful comment
A long awaited update to this article
Having played the OG and Beta2 many times over recent months, there are significantly more slum maps that OpenApoc does not generate
Some are listed here on the Stun Raid section of the wiki
https://www.ufopaedia.org/index.php/Stun_Raid
Additionally, it appears OpenApoc is not making the full range of other maps available for other building types and I shall therefore create another issue and reference this one....