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What did you do?

Placed an assembler set to copper wire with two beacons with speed module 2 in them, one on each side, and connected only the left one to power.

What happened?

The assembler received a +64% speed boost, instead of the expected 90% with one beacon.

What did you expect to happen instead? It might be obvious to you, but do it anyway!

The assembler receives a 90% speed boost from one beacon with 2x30% speed modules.

Does it happen always, once, or sometimes?

Always

As was published in FFF-409: Diminishing beacons, beacons have lower effect when they are affecting the same entity. It looks that, for optimization purposes, unpowered beacons still contribute to that diminishing returns policy. Powering the second beacon results in +127% speed, which is approx. 1.41x better than one beacon.