garbage when converting from Float to BigDecimal in Java

Question

When converting from float to BigDecimal in Java and getting some unexpected results. Notice "garbage" digits "23841858" in the first line and up to 7th line similarly in least significant digits:

Above code as text:

for (w <- (1 to 70))
{
  val wp = ten.pow(w, mc)
  val onePlus :BigDecimal = one.add(one.divide(wp, mc), mc)

  val flo :Float = onePlus.floatValue()
  val flo_to_d :BigDecimal = BigDecimal.valueOf(flo)

  println(f"""${w}: ${comp_decimals("float", onePlus, flo_to_d)}, dec=${onePlus}, flo=${flo}, flo_to_d=${flo_to_d} """)
}

I do not see this problem when trying to convert double to BigDecimal:

Above code as text:

for (w <- (1 to 70))
{
  val wp = ten.pow(w, mc)
  val onePlus :BigDecimal = one.add(one.divide(wp, mc), mc)

  val dou :Double = onePlus.doubleValue()
  val dou_to_d :BigDecimal = BigDecimal.valueOf(dou)
  
  println(f"""${w},${comp_decimals("double", onePlus, dou_to_d)}, dec=${onePlus}, dou=${dou_to_d} """ )
}

What is the fundamental difference in how conversion to BigDecimal from float and from double is done in Java?

I do understand that float only keeps 7 significant digits, while double keeps up to 15 significant digits. But this doesn't explain the odd trailing "trash" digits when converting from float to BigDecimal. FWIW, this issue only happens when converting from float to BigDecimal, and not other way around.

Btw, the below code is written in Scala, but it uses only Java native functionality when it comes to BigDecimal support. Java 8 / Scala 2.12. Java bug?