Older releases cannot boot newer builds via RAMDisk (wdfldr.sys 0x7E BSOD)

Noticed this while playing with OnWorks public virtual machines, as they only have ReactOS 0.4.11 release available:

• https://www.onworks.net/runos/create-os.html?os=ReactOS-0.4.11&home=init
• https://www.winfy.net/runwine/index.php?os=ReactOS-0.4.11 (mirror)

Steps to reproduce:

• Install an old ReactOS build (e.g. 0.4.13-release)
• Once installed, download the latest nightly (0.4.16-dev-1900-g7f10759 at moment of writing)
• Modify freeldr.ini RAMDisk entry to boot the bootcd.iso:

  [ReactOS_Ram]

  BootType=ReactOSSetup

  SystemPath=ramdisk(0)\

  Options=... /RDPATH=\bootcd.iso /RDEXPORTASCD

So, 0.4.11, 0.4.12, and 0.4.13 releases are unable to RAMDisk-boot recent nightly builds, getting a bugcheck 0x7E (SYSTEM_THREAD_EXCEPTION_NOT_HANDLED) in wdfldr.sys with status 0xC0000005 (STATUS_ACCESS_VIOLATION). This problem started with 0.4.16-dev-1864-g3fe5b8b, so it's a regression.

• 0.4.16-dev-1863-g4207992 - booting fine
• 0.4.16-dev-1864-g3fe5b8b - wdfldr.sys BSOD 0x7E / 0xC0000005

Also it's hard to debug, because the builds are not talking to serial port, related to the setup process changes in later builds.

Bisecting where it started to boot newer builds fine:

• 0.4.14-dev-13-gb3f45a2 - wdfldr.sys BSOD 0x7E / 0xC0000005
• 0.4.14-dev-17-g9ad0dd1 - GPF
• 0.4.14-dev-20-g2f4fb90 - GPF
• 0.4.14-dev-22-g2d1a6b2 - setup ok, no serial

Skipped builds are either not buildable or have GPF on early boot.

Bisecting where serial debug started working:

• 0.4.15-dev-1260-gd45b268 - setup ok, no serial
• 0.4.15-dev-1261-g4792c00 - setup ok, serial ok

It was possible to get debug log output by cherry-picking changes from 0.4.15-dev-1261-g4792c00 and closely related commits on top of 0.4.14-dev-13-gb3f45a2: 0.4.16-dev-1913-gef03e09.log