Sorry it took so long for me to get back to you on this.
So the problem here was that a decade ago (oh god has it been that long) when HammUEr was created, all my test maps were Proper Quake Maps, which were nicely cut down to a handful of digits after the period, so I was all "oh, cool, I just need to use floats for this".
Enter your test maps, which are Technically Quake Maps But Not Really and have super tiny values like
8.552847072295026e-49
(that's 0.[48 zeroes]8552etc) in them, which float takes one look at and goes "nope".
The new Not Fucking Dead update has been rewritten to use doubles for everything, as it always should have, and loads your crashing maps without problems.