As far as I know the void biome generated by the superflat preset void is supposed to not spawn any mobs. But the new Phantom mobs do.
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Does this affect the current snapshot 1.13-pre3?

actualicen el bug a 1.14 pre relase 2

Confirmed for 1.14.1

Confirmed in 1.14.2 and
in 1.14.3 as of changelogs for 1.14.3 and changelogs for 1.14.3-pre1 through 1.14.3-pre4
Yes the line space is intended, note it for confirmation basis(s)

Confirmed in 1.13-pre3 (asked)
1.14.1
and 1.15 versions at random inclusing base (1.15.0)
Is this still an issue in the latest release?

I can confirm this is still an issue in 1.17 pre-release 1

Can confirm in 1.20.1