AArch64 decompile error introduced in 11.2.1: Low-level Error: Overlapping input varnodes

[hairlessbear]

Describe the bug
When attempting to decompile certain functions in a large C++ AArch64 binary, decompilation fails with the error Low-level Error: Overlapping input varnodes

Environment (please complete the following information):

• OS: Ubuntu 22.04.5
• Java Version: 21.0.5
• Ghidra Version: 11.2.1
• Ghidra Origin: official GitHub distro

Additional context
I tested the same binary in previous Ghidra releases and determined that this bug only occurs in 11.2.1. I also built from the current master (commit e0fd708) and confirmed the bug is still present.

For all of these tests, I exported a Ghidra zip from 11.2.1 (where the bug was occurring) and imported it into the other Ghidra versions (where, pre-11.2.1, the bug did not occur).

Unfortunately, I'm unable to share the decompiler debug output or the binary that causes the problem.