Hey, long story short - I do not find "expanding my box over it" a compelling way to get resources, so I added fortified trains, but nuclear biters still can expload rails even if "immortal rails" setting is on

I think I know what's going on.
In recent versions of Rampant Fixed for Factorio 2.1, Nuclear Biters create special tiles that can't be built on without concrete.
I will allow rails to be built on these tiles and the rails will not be deleted

I can't give you a date for the new release yet, but don't expect it in the next few days

This also affects elevated rails?

Maybe. It's good that you mentioned them. I'll take a look.

Hi, I'm having issues with nuclear bitters, the special tiles and surfaces in general. I'm fine with them leaving them and having to tile concrete on top of it, but why does it delete it if it was already there? I mean, OK, they smashed it to pieces, but why doesn't leave the blueprint so it can be replaced by bots. I mean the tiling gets deleted (not destroyed) by the explosion mark and therefore the rail can't be replaced afterwards or also gets deleted I'm not sure exactly what's the process here.

There is/was a similar issue that happened to me rarely where I believe it's electric beam bitters deleting something from the BP and then bots are unable to replace it, but this one I haven't seen from some time. This could be something like an item got destroyed, and then before it gets replaced the bitters place an egg or crystal or whatever crap they plant I'm not sure what causes this one but it does happen.

Is that how it's supposed to be?, I mean, after all this an automation game, so there should be a way to scratch your head until you manage to automate a solution and having items from the blueprint disappearing out of thin air is more annoying than fun.