As for now, mines dropped from bombers - e.g. 1000lbs mark a from a PB4Y - will not damage airfields. While they do damage and destroy ground targets as well as bases, they will just explode on airfields without effect. Not a map related problem, since it took damage from other sources.
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You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)