TNtuple::ReadFile with values spanning lines

ROOT
1

Dear Rooters,
the following used to work with 5.34.11:

TNtuple * nt = new TNtuple("exa", "exa", "a:b:c:d");
nt->ReadFile("in.dat");

with in.dat:

3 5 
14 2 
7 8 
12 5

As of version 5.34.18 one gets:

Is this intended, I didnt find anything in the Release Notes between 5.34.11 and 5.34.18

Cheers
Otto