[BUG-640b1] Crash with IDE compile but not command line?

[skywalk]

Ok, the v640 plot thickens.
While shrinking 1 of my apps(35k LOC) to PM to Fred, I found that command line compiles for both v630 and v640b1 actually work.
But all v640alphas through v640b1 IDE compiles crash hard.

If I try to compile these settings from the v640b1 IDE, I crash.
C:\purebasic-x64-640b1\compilers\pbcompilerc -c -z -t "C:\dev-640\myapp\myapp.pbi" /DYNAMICCPU /XP /UCRT /ICON "C:\dev-640\myapp\img\myapp-32x32.ico" -o "c:\dev-640\myapp\myapp-x64v640b1.exe"

These same settings work in IDE v630.
C:\purebasic-x64-630\compilers\pbcompilerc -c -z -t "C:\dev-640\myapp\myapp.pbi" /DYNAMICCPU /XP /UCRT /ICON "C:\dev-640\myapp\img\myapp-32x32.ico" -o "c:\dev-640\myapp\myapp-x64v630.exe"

I will send Fred the code today after confirming what I'm seeing now.