Hello, I think I found a bug.
When I put an empty furnace down on a reinforce ground of any tier, I can see the bonus applied, but when the furnace is feeded with fuel and ore the bonus disappears.
I have the same behavior for vanilla and modded electric furnace

Seems like it comes from one of the mods, I am trying to find which one

Found it : Bio Industries
When furnace are idle the bonus appears but disappears when they run
When assembler doesn't have a recipe set the bonus appears but disappears when one is set

And I don't know why but assemblers doesn't have the issues when inside a factorissimo building but furnace still does

This isn't an issue with the standard beacons right? Or does it also remove standard beacon bonuses? Haven't used the mod but I'll take a look at it sometime.

Just tried
Standard beacons seem to work. When furnace are off, both bonuses appears but only the beacon bonus stays when the furnace runs.

I also encountered such a problem, the furnace and assembly machine can enjoy the floor bonus when idle and in the state of raw material shortage, but once the formula is set or in the working state when the floor bonus will disappear, the mining machine currently does not have this problem to enjoy the floor bonus