Why isn't my processor variant showing up in the list?

[LegacyNsfw]

For reference, I'm working on adding support for CPU32 instructions to the 68000 processor family, as per this issue: #1244

At some point, CPU32 stopped appearing in the list of processor languages that I'm offered when I import a binary file.
Checking/unchecking the "show only recommended" box makes no difference.
I tried reverting to a known-good version of my slaspec and sinc files.
I even tried reinstalling Ghidra.

When I build the 68000 language project using Ant, it says that it processed my slaspec file with no errors.
The only error in the Ghidra log is about an "illegal reflective operation" which I think was present in the umodified Ghidra installation as well:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by net.sf.cglib.core.ReflectUtils$2 (file:/C:/Apps/ghidra_9.2.1_PUBLIC/Ghidra/Framework/Generic/lib/cglib-nodep-2.2.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of net.sf.cglib.core.ReflectUtils$2
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

I get this error in the log when I try to reopen an existing project that used my CPU32 stuff:

2020-12-30 01:06:45 ERROR (OpenProgramTask) Error Opening 12587603.bin: Language not found for '68000:BE:32:CPU32'
Please contact the Ghidra team for assistance.  

So, here I am trying to contact the Ghidra team for assistance... :) How can I get back to work on my CPU32 Sleigh stuff? Are there any steps I could take that would help diagnose this situation?

Thanks!

[LegacyNsfw]

...and no it's not the "Filter" feature of the language-selection UI that's getting in the way. CPU32 used to be the 3rd thing in the list by default, and the only thing in the list if I type "cpu32" into the filter box. Now it doesn't appear at all.

The "Ghidra\Processors\68000\data\languages" directory contains a CPU32.sla file which would seem to imply that my Sleigh code compiled. It just doesn't show up in the "Select language and compiler specification" list when I open a binary file.

[LegacyNsfw]

It was all due to the 68000.ldefs file being replaced with the main-branch version.