When the quarry is creating its frame,
it will break even bedrock,
to create its frame.

Maybe check the block hardness,
skip the ones harder than 4,000,
and use energy to break the hard ones?
(I suggest 1MJ * block hardness)

The quarries could go through mffs's force fields,
and cause supposedly safe areas to be damaged.

Maybe also make the quarry to use a fake player,
to make the blocks to crack while being broken.

while this is indeed a valid bug report that has to be looked intro, bug reports should go on the bug reports board on the forum, github issues are mainly keeping track of who is fixing what

http://mod-buildcraft.com/forums/index.php?board=2.0

but indeed, this should be fixed, if it breaks bedrock it breaks everything

@undergroundminer3 going to the forum is the best way to discuss and confirm that one. In particular, we'll need to know what version of BuildCraft you're on. This is not supposed to happen with recent 6.0 versions. Thanks for your help!

Still trying to fix this,

Seems like this applied to every single builder...

Just fixed :-)