I support this report. Previously, it was occasionally possible to dismantle structures while a base was being captured, but as far as I could tell, this was a rare bug. Normally, you had to capture the base first before you could dismantle its structures, most importantly the radio relay station.

After patch 1.8, any enemy structures can be dismantled as soon as the base starts being captured, even if there is only one player capturing it. This completely ruins Engineer gameplay. There is basically no point in building up bases anymore, because dismantling enemy bases is much more effective.

You do not even need to dismantle the whole base. You can simply approach it, dismantle the radio relay station, and move on to the next base.

Is this really intended behavior? From the way the game works, it seems much more logical that the base should first be captured, and only then should its structures become available for dismantling.

I only play on vanilla Kolguyev.