So the devs of AW2 mod said this

"WARNING NOTE: Most recent test worlds showed a MASSIVE incompatibility between AW2 and Recurrent Complex - if RC is used it totally screws AW world gen to the point where AW2 structures spawn over each other and inside each other, and RC structures spawn in the middle of AW2 towns and cities and demolish large areas. This is due to RC - there is nothing we can do on our side - so if you use the two mods together - expect large scale problems."

I asked if they could fix it, but they said there's nothing they could do about it, so can you take a look at this please? (1.12.2)

I'm not really actively developing ReC much these days, so don't expect a solution anytime soon.

ReC isn't doing anything weird. I don't know what messes with their structure generation, but as for their towns, I recommend them registering them in Forge. ReC tries to scrape all available resources for avoiding generation, but if they don't register them anywhere, there is no way to avoid generation.

If any of them could drop onto my Discord server, we could discuss short-term fixes probably.