I think there should be something called strength. Its like a slider. The minimum is Breakable then there is stuff in between Breakable and Brittle, then stuff in between Brittle and Unbreakable.
All of them are for stability. Super bouncy stuff, heavy stuff, and very large scales stress and mess with the physics too much. Simulation speed should be fine at low values though so I'll be changing that clamp back to 1% at some point.
Known bug. Not Black Hole specific, but applies to all particles that use the so-called Laser particles. Haven't found a proper fix yet but it's tracked.
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Working here. I fixed them by fixing the black hole a while back. Refresh.