New world generation doesn't populate edges of old world

Is this still an issue in the latest snapshot 18w20c?

Now I can't even load a world from 1.12 in 18w20c nor 18w21a. Log spams preparing spawn area 0%. Reported as MC-130182

MC-130182 no longer blocks this ticket.
A test here showed that the issue is fixed, see screenshot.

Can't confirm as fixed. 1.13pre8 affected. Screenshot attached.

Can you please provide the seed.

testcase is in MC-130182 - worldsave 5178019746038571832.zip
after opening it in 1.12 - all ok.
after opening it in 1.13 - line of unpopulated terrain 8-blocks width at 250/Y/-2700

EDIT: Reuploading testcase here.

Was able to reproduce with the provided world download. Thank you.